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22 Sep 2021 : four-digit number

Suppose 4 digits 2, 4, 6, and 9 are given. You have to make a four-digit number. In how many ways it can be done, if repetition of the numbers does not allowed.

OPtion

1. 15
2. 22
3. 26
4. 28
5. 256
6. 24
7. 36
8. 148
9. 64
10. None of the above

Solution

Required number of 4 digit number = n! / (n – r)!
= 4! / (4 – 4)! = 24

Correct Option: 6 Best Solution (3)