1.

Total number of 10 – digit numbers in which only and all the digits 1, 2, 3, 4, 5, 6, 7, 8, 9 appear, is:

Answer»

`5/2(10!)`
`7/2(10!)`
`9/2(10!)`
NONE of these

SOLUTION :`9_(c_1)XX(10!)/(2!)` as repeated DIGIT have only 9 choices


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