Mathematics: Post your doubts here!

[black widow]

Hey guys
I have a question in set theory , in the part where n(f) and n(AuD) etc comes . How can i know the difference of n in both the cases ? Sometimes n is the number of elements in the set and sometimes it is the sum of the elements in the set ! Thank you in advance

n is the no. of elements in the set
it is not the sum of elements in the set,
when u have n(A U B), then u write down the elements that satisfy the question. One u do that, count the no. of elements that satisfy it, and that is ur answer

 

[Mahmood Magdy]

n is the no. of elements in the set
it is not the sum of elements in the set,
when u have n(A U B), then u write down the elements that satisfy the question. One u do that, count the no. of elements that satisfy it, and that is ur answer

The answer to c part is 8. How is this ? thank you anyways

 

[black widow]

The answer to c part is 8. How is this ? thank you anyways

cud u give me the answers to the previous parts, and par (c) is dependent on them
or at least the value of x

 

[Mahmood Magdy]

cud u give me the answers to the previous parts, and par (c) is dependent on them
or at least the value of x

hahahaha so funny
X - 4 and Y - 26

 

[black widow]

hahahaha so funny
X - 4 and Y - 26

whats so funny?

now to the question, the question is really simple
u have to divide the part asked
first solve the (A U B)' part. A U B involves the entire A and B sets. their complement is 8 which is the part of C that is not a part of A and B
now this part intersection C is 8 as the common thing is the 8

thus the answer is 8

 

[Mahmood Magdy]

whats so funny?

now to the question, the question is really simple
u have to divide the part asked
first solve the (A U B)' part. A U B involves the entire A and B sets. their complement is 8 which is the part of C that is not a part of A and B
now this part intersection C is 8 as the common thing is the 8

thus the answer is 8

Yup , your answer is correct !
So if they ask for example n(F) i will count the number of elements in the set

And if they ask n(A U B ) , i will write the elements present in that region ? OR should i count them and write the number of the no. of elements ?
Cuz in this question, the very last sub-question how could it be union ??

 

[black widow]

Yup , your answer is correct !
So if they ask for example n(F) i will count the number of elements in the set

And if they ask n(A U B ) , i will write the elements present in that region ? OR should i count them and write the number of the no. of elements ?
Cuz in this question, the very last sub-question how could it be union ??

in the previous question, they stated that
THE VENN DIAGRAM SHOWS THE NO. OF ELEMENTS IN SETS A, B, AND C
like before can u give me the answers to the previous parts, or it wud be better if u give me the constituents of the sets
f

 

[Mahmood Magdy]

in the previous question, they stated that
THE VENN DIAGRAM SHOWS THE NO. OF ELEMENTS IN SETS A, B, AND C
like before can u give me the answers to the previous parts, or it wud be better if u give me the constituents of the sets
f

a) is 2 4 6 8
b) 3
c) ii) 4 9

 

[black widow]

k so this is what we have



and the question is
n(E ______ F ) = 6
if we put the intersection sign, it will be wrong as there is only one common element (2), and the value will be 1
if we put the union sign, it will be correct as we will have 6 values (8,4,2,6,5,7)

so the answer is

n(E U F) = 6

 

[Mahmood Magdy]

k so this is what we have

View attachment 36031

and the question is
n(E ______ F ) = 6
if we put the intersection sign, it will be wrong as there is only one common element (2), and the value will be 1
if we put the union sign, it will be correct as we will have 6 values (8,4,2,6,5,7)

so the answer is

n(E U F) = 6

Ohh ! So n means the no of elements, either it is a region or a single set , the no of elements in it is represented by n Thanks for helping me ! I had a problem in this n thingy for ages ! Actually i am giving ig's this year ! are you giving too ?
Thanks again !!

 

[black widow]

Ohh ! So n means the no of elements, either it is a region or a single set , the no of elements in it is represented by n Thanks for helping me ! I had a problem in this n thingy for ages ! Actually i am giving ig's this year ! are you giving too ?
Thanks again !!

no i am giving O Levels this year in the May/June session
np

 

[Mahmood Magdy]

no i am giving O Levels this year in the May/June session
np

Hey again
Could you tell me how to factorise bulky equations like 25y^2 + 25y - 36
thank you !

 

[sohaib ul haq]

Plz can any one give topical past paper qustions of matamitic 0580 igcse

 

[♣♣ vishal ♠♠]

Hey again
Could you tell me how to factorise bulky equations like 25y^2 + 25y - 36
thank you !

bro try to solve this equation by equation method :
that b^2-4ac/2a wali..!!
check this link for formula..!! : http://www.purplemath.com/modules/solvquad4.htm
the answers will be {-1.8,0.8}
I hope it helps..@@@!!!!!!

 

[Mahmood Magdy]

bro try to solve this equation by equation method :
that b^2-4ac/2a wali..!!
check this link for formula..!! : http://www.purplemath.com/modules/solvquad4.htm
the answers will be {-1.8,0.8}
I hope it helps..@@@!!!!!!

Thanks but still i wanted to learn how to factorise the equation not to solve it Like splitting the middle term ....etc I really dont now how to do it

 

[♣♣ vishal ♠♠]

Thanks but still i wanted to learn how to factorise the equation not to solve it Like splitting the middle term ....etc I really dont now how to do it

so brox.!!!
There are here some links for which you can practise the problems.!!
click here
CLICK HERE
http://www.purplemath.com/modules/solvquad.htm
THIS IS THE LINK : HOW TO SOLVE IT.!! : http://www.mathsisfun.com/algebra/factoring.html.
http://library.thinkquest.org/29292/quadratic/2factoring/practice.htm
GO TO KHANACADEMY .ORG where you will find best videos on mathematics...!!!
I hope it helps..!!

 

[Nafis Daiyan]

so brox.!!!
There are here some links for which you can practise the problems.!!
click here
CLICK HERE
http://www.purplemath.com/modules/solvquad.htm
THIS IS THE LINK : HOW TO SOLVE IT.!! : http://www.mathsisfun.com/algebra/factoring.html.
http://library.thinkquest.org/29292/quadratic/2factoring/practice.htm
GO TO KHANACADEMY .ORG where you will find best videos on mathematics...!!!
I hope it helps..!!

You can get a lot of help from the videos of Khan Academy. Not only in maths, but in other subjects as well

 

[♣♣ vishal ♠♠]

You can get a lot of help from the videos of Khan Academy. Not only in maths, but in other subjects as well

yeah i know.!!! i was just telling him for maths.!! btw thnxx for telling me.!! again.!!

 

[Nafis Daiyan]

Any time, bro.

 

[Usman Abdul Jabbar]

Hi guys,

Guys Please I know it is alot of questions. Please tell me any of them or please be kind enough to answer all questions if it is possible.

​

My name is Usman Jabbar I am a new member and am sitting for the CIE exams in OCT/NOV 2014 session. Guys what I wanted to ask is that I am have some problems with rational and irratioinal numbers. May anyone please help me clearly understand about these.

I also have a book problem. Please tell me why it has the green and red line on it. The book name is IGCSE Mathematics by Hodder Education.

1. Please solve them for me and how you solved them.

I want to ask:

1. Do we have to convert to identify rational and irrational numbers?
2. How do we calculate them?
3. If number is rational so do we have to convert it to a fraction?
4. Is it necessary to show it as a fraction?
5. Do you have methods on how to convert rational numbers to fractions?
6. Would (√ Root 2 √3)2 square be rational. If it is please tell me how to calculate it.
7. May someone please explain SIGNIFICANT FIGURES to me.
8. Also on the attachments please tell me why the shapes used are rational or irrational? and please give reason for answers.

THANKS
Usman Abdul Jabbar Shaikh