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Q.

In a shop there are five types of ice-creams available. A child buys six ice-creams.
Statement -1: The number of different ways the child can buy the six ice-creams is 10C5.
Statement -2: The number of different ways the child can buy the six ice-creams is equal to the number of different ways of arranging 6 A’s and 4 B’s in a row.

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a

Statement −1 is false, Statement −2 is true

b

Statement −1 is true, Statement −2 is true, Statement −2 is a correct explanation for Statement −1

c

Statement −1 is true, Statement −2 is true; Statement −2 is not a correct explanation for Statement −1.

d

Statement − 1 is true, Statement − 2 is false.

answer is A.

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Detailed Solution

Statement-l: Number of ways = Number of non negative integral solutions of the equation 

x1+x2+x3+x4+x5=6=6+5-1C5-1=10C4.
∴ Statement-l is wrong.

Statement-2:
Number of different ways of arranging 6A's and 4B's in a row =10!6!4!=10C4
∴ Statement-2 is correct.

 

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