Question

If n = 5 and r = 3 Find "Cr.​

Answer 1

Pi*r^2

Explanation:

If your finding circumfrence the equation is Pi*r^2

So your equation would be 3.14*3^2

So 3^2 would be 3*3=9

Multiply 9 by 3.14

your answer would be 28.26

Answer 2

Cr = 10

Explanation:

To calculate combinations we use the nCr formula: nCr = n! / r! * (n - r)!, where n = number of items, and r = number of items being chosen at a time.

`C(n,r)=[?]`

`C(n,r)=C(5,3)`

`=(5)/((3!(5-3)!))`

`=(5!)/(3!*2!)`

`=10`

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