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7. Permutations and Combinations
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Q38 of 64 Page 122

The total number of 9 digit numbers which have all different digits is


The place can filled by 9 way


Last places can be fill by 9! way


The total number of 9-digit numbers which have all different digits is


=9.9!

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Questions · 64
7. Permutations and Combinations
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