Mathematics: Post your doubts here!

[chishtyguy]

Help!
In how many ways can 13 cards in a pack of 52 cards be arranged?

52P13

 

[RoOkaYya G]

52P13

shldnt combination be used here? as well as permutation ofc

 

[chishtyguy]

shldnt combination be used here? as well as permutation ofc

no. all cards are different and they are to be arranged and not chosen.

 

[RoOkaYya G]

no. all cards are different and they are to be arranged and not chosen.

owwkay .-.
ty

 

[Lostsoul]

Help:
If the letters of the word 'MINIMUM' are arranged in a line at random. What is the probability that the arrangement begins with MMM?

 

[Lostsoul]

Again:
In how many ways can 10 students be arranged in a way that 2 youngest are separated?

 

[Lostsoul]

I. How many 4 digit numbers can be formed from the digits 1,2,3 and 5 If repetitions are not allowed?

II. How many 4 digit numbers divisible by 5 can be formed from the digits above?

 

[Keirad]

I. How many 4 digit numbers can be formed from the digits 1,2,3 and 5 If repetitions are not allowed?

II. How many 4 digit numbers divisible by 5 can be formed from the digits above?

I- 4!
II- 3!

 

[Lostsoul]

I- 4!

Thanks
For part II you take it as non repeating again?

Why not 3! +/× 2! ?

Thanks in advance

 

[Keirad]

For II
Sorry...my mistake
If it can be repeated then it will be 4^3

 

[Snowysangel]

find normal (n hat) by doing cross product with the direction of line l and the directon vector A.

replace in the formula r. n hat = a . n hat

a can be the point in line equation (4,-2,2)

replace n u get the answer.

That's the normal to the plane right? How do you find it?

 

[RoOkaYya G]

That's the normal to the plane right? How do you find it?

cross product of direction of line n direction vector A
i mentioned it there

 

[Snowysangel]

cross product of direction of line n direction vector A
i mentioned it there

Yeah what's the general equation for it? Is it the cross product of the position vector of any point on a plane and the direction vector? Isn't the direction of line l the same as the direction vector A?

 

[Lily9605]

Hi..could someone tell me how to do qn 2?

 

[ahmed butt]

can anyone tell me how to study math as level pure math and stats 1

 

[RoOkaYya G]

can anyone tell me how to study math as level pure math and stats 1

practice papers a lot.

 

[Thought blocker]

can anyone tell me how to study math as level pure math and stats 1

Understanding concepts and applying them into exercise and papers is the way. All the best.

 

[TimBluesWin]

Hey everyone....

How's your statistics's exam? I'm taking variant 2 btw....

 

[Thought blocker]

TimBluesWin Paper has been successfully uploaded with the worked solutions. Check out my signature.

 

[Salman Shah Jee]

When it says , Find all the roots in the interval (-180 < x <180) of the following equations : 1) 4 sin X = 5 cosX 2) cos3X =2/3
Now what is the difference between cos3X and 3cos X? Are they both same? . And which roots lie in the interval ( -180 < x < 180)??????...What does -180 means? Plzzz solve both question step by step.Thanks