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

Sir? sir? are u there? help me -_--example-1
User Forker
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1 Answer

5 votes

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=(n!)/(r!(n-r)!) where n is the total number of items and r is how many you are selecting.

Plug in values:


(9!)/(7!(9-7)!) =(9!)/(7!*2!)=(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=(n!)/((n-r)!) where n is the total number of items and r is how many you are selecting.

Plug in values:


(9!)/((9-7)!) =(9!)/(2!)=9*8*7*6*5*4*3=181440

User David Jones
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