1.

The total number of 9 digit numbers which have all different digits is(a) 10!(b) 9!(c) 9 × 9!(d) 10 × 10!

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

(a) 10!

(b) 9!

(c) 9 × 9!

(d) 10 × 10!


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