Mathematics: Post your doubts here!

[ahmed abdulla]

I am just guessing btw. For y to be zero, either sin or cos have to be zero. Graph starts at zero as sin is zero. Then graph comes to zero when cos is zero. Which is at 2X=pi/2. Therefore x=pi/4. For one area the interval is of pi/4. For 40 A it must be 40/4=10pi. Is my answer correct?

unfortunately no

 

[chuchoo]

Hi everyone. I'm new here. Please help me with this S1 question:
In how many ways can the word ANEMIOUS be arranged if the vowels are to be alphabetical order?

 

[Suchal Riaz]

unfortunately no

No my answer is correct. It is 10pi. Meaning k=10.

 

[ahmed abdulla]

No my answer is correct. It is 10pi. Meaning k=10.

You have to use your answer in the previous part (i)

 

[Suchal Riaz]

You have to use your answer in the previous part (i)

i know that. but it is a 2 marks question and it was easy to spot that the answer is 10. just a few seconds of mental calculations and i came up with this answer. and it is correct. you can take the longer route if u want. i was too lazy to integrate that expression as u wanted the answer to the second part not the first.

 

[Ahmed Aqdam]

Hi everyone. I'm new here. Please help me with this S1 question:
In how many ways can the word ANEMIOUS be arranged if the vowels are to be alphabetical order?

In any rearrangement of the word ANEMIOUS, there are 5! ways to permute the vowels in the word. Only 1 of out these 5! ways is correct. Therefore, out of the 8! possible arrangement of the letters in the word ANEMIOUS, only 1/5! of these arrangements have the 5 vowels in alphabetical order. Thus, the number of ways to arrange ANEMIOUS, keeping the vowels in alphabetical order, is 8!/5! =336

 

[Suchal Riaz]

Keeping the permutaion of vowels the same, there are 8 ways to arrange the first consonent, 7 for the second and 6 for the third consonent. So the answer will be 8*7*6=336
I used a different way to do but i got the same answer so i guess the answer will be correct.

In any rearrangement of the word ANEMIOUS, there are 5! ways to permute the vowels in the word. Only 1 of out these 5! ways is correct. Therefore, out of the 8! possible arrangement of the letters in the word ANEMIOUS, only 1/5! of these arrangements have the 5 vowels in alphabetical order. Thus, the number of ways to arrange ANEMIOUS, keeping the vowels in alphabetical order, is 8!/5! =336

 

[itallion stallion]

This question is not from past papers it's from advanced level statistics by J.crawshaw and chambers.
Page no
Page 377 q6 and 9.
Q6)bags of flour packed by a particular machine have masses which are normally distributed with mean of 500g and standard deviation of 20g.2% of the bags are rejected for being underweight and one percent of the bags are rejected for being overweight?between what range of values should the mass of a bag of flour lie if it has to be accepted.


Q9)mean=400 and standard deviation is 8
A)find the limits within which the central 95% of the distribution lies.
B)find the inter quartile range of the distribution.



Plz solve these questions.thanks a lot!!

 

[chuchoo]

In any rearrangement of the word ANEMIOUS, there are 5! ways to permute the vowels in the word. Only 1 of out these 5! ways is correct. Therefore, out of the 8! possible arrangement of the letters in the word ANEMIOUS, only 1/5! of these arrangements have the 5 vowels in alphabetical order. Thus, the number of ways to arrange ANEMIOUS, keeping the vowels in alphabetical order, is 8!/5! =336

Thanks

 

[Adiizz]

Please help me with this...
A committee of 5 people is to be chosen from 6 men and 4 women. In how many ways can this be done if there must be 3 men and 2women, and one particular woman refuses to be on the committee with one particular man?

Thanks in advance.

 

[ahmed abdulla]

Can someone plz help me with Mechanics 2 - Topic centre of mass ?

Everytime the cie people keep on changing the question , i know there is a Concept behind this .
( I know how to drive equations ) , but i dont know when to add / subtract the expression in question ,, everytime they change !
Can some help with explaination?? ( snowbrood )
On e example ,question 6 http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_w11_qp_53.pdf

 

[Suchal Riaz]

There must be three men, two women. For the three men, there are 6C3 combinations. For women there are 4C2 combinations. So the total is 6C3*4C2=120
Lets find in how many combinations can both man and woman be in the committee. If they both are selected, there are 5C2 combinations of men. And 3C1 combinations of women. So there are 30 combinations in which both are together. If we subtract this by total combinations, we get the combinations in which those man and women are both at the same time not in committee. 120-30=90

 

[Bilal Ayub]

ALEVEL MATHEMATICS PAPER 3(P3) NOTES ARE AVAILABLE AT A VERY CHEAP PRICE OF RS.400. THEY ARE VERY WELL WRITTEN AND ARE VERY COMPREHENSIVE. THEY ARE EASY TO UNDERSTAND AND COVER ALL CONCEPTS WITH EXAMPLE QUESTIONS. TO GET THEM PLEASE CONTACT 0345-4004153

 

[ahmed abdulla]

ALEVEL MATHEMATICS PAPER 3(P3) NOTES ARE AVAILABLE AT A VERY CHEAP PRICE OF RS.400. THEY ARE VERY WELL WRITTEN AND ARE VERY COMPREHENSIVE. THEY ARE EASY TO UNDERSTAND AND COVER ALL CONCEPTS WITH EXAMPLE QUESTIONS. TO GET THEM PLEASE CONTACT 0345-4004153

do you have m2 notes??

 

[Bilal Ayub]

no just P3 notes.

 

[periyasamy]

Hai guys ,seriously need a help here.Thanks a lot...
http://papers.xtremepapers.com/CIE/...S Level/Mathematics (9709)/9709_s10_qp_31.pdf
Guys,question 9 part 1.Pls guys..

 

[Suchal Riaz]

Hai guys ,seriously need a help here.Thanks a lot...
http://papers.xtremepapers.com/CIE/Cambhttp://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_s10_ms_31.pdfridge International A and AS Level/Mathematics (9709)/9709_s10_qp_31.pdf
Guys,question 9 part 1.Pls guys..

I had to use a lot of manipulation of indices, comversion of (1+x)(1-x)=1+x 2 . It required a lot of algebra. So be careful.

 

[Suchal Riaz]

Can someone plz help me with Mechanics 2 - Topic centre of mass ?

Everytime the cie people keep on changing the question , i know there is a Concept behind this .
( I know how to drive equations ) , but i dont know when to add / subtract the expression in question ,, everytime they change !
Can some help with explaination?? ( snowbrood )
On e example ,question 6 http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Mathematics (9709)/9709_w11_qp_53.pdf

do they really give 3d figues of these kinds of questions or it is the first time? and my research on internet told me that we need multivariable calculus to find centre of mass of a 3d object. wtf?

 

[Suchal Riaz]

the syllabus uses the word 'lamina' which means it has no width. lamina is a 2d object.

 

[periyasamy]

I had to use a lot of manipulation of indices, comversion of (1+x)(1-x)=1+x 2 . It required a lot of algebra. So be careful. View attachment 36591

Thank u boss!!!