Question

How many numbers are between 100 and 1000 can be formed with the digit without repetition

Answer 1

If repetition is not allowed

Hundred's place has 9 possibilities - 1,2,..9

Ten's place also has 9 possibilities (since 0 can also be in the ten's place)

And unit's place has 8 possibilities.

Therefore the number of digits will be -

9*9*8 = 648 numbers.

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