supermanaccz

HAHA

For geometric series, there are many difference formulas to find the sum. 

For infinite geometric series, those that don't have an end, (A₁)/(n-1)

For those that do have an end, S_n = [A₁(1-rⁿ)]/(1-r)

r is the common ratio, A₁ is the first term and n is the nth term. 

To find the nth term: 

A_n = AR^n-1

Here they are anyways:

Finding the n^th term: A_n = A₁ + d * (n - 1)  

S_n = (n/2)*(A₁ + A_n)

d is the common difference, A_n is the n^th term, A₁ is the first term.

What do you mean by formula, the sum? finding the nth term?

Do you know what I did wrong?

Here's my work, I know it's wrong but I don't know where. 

There are 52 choose 2 ways to choose 2 cards, which is 1326. 

There are 4 choose 2 ways to get 4 kings

20 ways to get the aces. 

(20+4)/1326 = 1/221

This is not possible because to get one ace it is 1/13 chance. 

Can someone tell me what I did wrong?

A prime number is a natural number greater than one that cannot be formed by multiplying two smaller natural numbers.

The only way I can think of to approach this problem is to plug in some values and try. 

Three works because three squared is nine, and nine minus sixteen is negative seven. The absolute value of that is seven, which is a prime number. 

Since negative numbers are also integers, negative three must also work.

The two numbers are 3 and (-3)

The product of these two numbers is 3 * (-3) which is -9

I hope this helped, 

Supermanaccz

x = 180° - 27° + 360° n, x = 360° n + 27°

I'n just going to tell you the answer so I don't have to retype the whole thing :)

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