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A shopkeeper places before you 41 differ...

A shopkeeper places before you 41 different toys out of which 20 toys are to be purchased. Suppose m = number of ways in which 20 toys can be purchased without any restriction and n = number of ways in which a particular toy is to be always included in each selection of 20 toys, then `(m - n)` can be expressed as

A

`(2^(10))/(20!)(1.3.5"….."39)`

B

`(2^(20)(1.3.5"….."19))/(10!)`

C

`underset(r=0)overset(19)(II)((4r+2)/((20-r)))`

D

`(21/1)(22/2)(23/3)"…."(40/20)`

Text Solution

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The correct Answer is:
A
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