Q.5. How many 6-digit numbers can be formed from the digits 0, 1, 3, 5, 7 and 9
which are divisible by 10 and no digit is repeated?
For the number to be divisible by 10, unit digit should be 0.
Thus, 0 is fixed at a unit place.
Therefore, the remaining 5 places should be filled with 1,3,5,7,9.
The remaining 5 vacant places can be filled in ways.
Hence, the required number of 6 digit numbers which are divisible by 10
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