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  4. If the number of six digit numbers which contain exactly four different digits such that exactly one digit repeats, is k (7 !), then find k / 2.

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Q. If the number of six digit numbers which contain exactly four different digits such that exactly one digit repeats, is $k (7 !)$, then find $k / 2$.

Permutations and Combinations

Solution:

Correct answer is '9'