Q.

A crocodile is known to have not more than 68 teeth. The total number of crocodiles with different set of teeth is

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a

68

b

68!

c

1617

d

6868

answer is C.

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Detailed Solution

The required number is equal to the number of all the subsets of a 68 elements set i.e.,68C0+68C1+68C2+…+68C68=268=1617
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A crocodile is known to have not more than 68 teeth. The total number of crocodiles with different set of teeth is