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Masteriza [31]
3 years ago
15

Sir? sir? are u there? help me -_-

Mathematics
1 answer:
vfiekz [6]3 years ago
5 0

Answer:

a) The easiest way is to use a calculator such as a Casio brand or Sharp brand and key in 9C7 to get 36.

However, you can also use this formula: nCr=\frac{n!}{r!(n-r)!} where n is the total number of items and r is how many you are selecting.

Plug in values:

\frac{9!}{7!(9-7)!} =\frac{9!}{7!*2!}=\frac{9*8}{2!}=36

b) The easiest way is to use a calculator such as a Casio brand or Sharp brand and key in 9P7 to get 181440.

However, you can also use this formula: nPr=\frac{n!}{(n-r)!} where n is the total number of items and r is how many you are selecting.

Plug in values:

\frac{9!}{(9-7)!} =\frac{9!}{2!}=9*8*7*6*5*4*3=181440

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