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  4. Number of 4-digit numbers (the repeation of digits is allowed) which are made using the digits 1,2 , 3 and 5 , and are divisible by 15 , is equal to

Q. Number of 4-digit numbers (the repeation of digits is allowed) which are made using the digits 1,2 , 3 and 5 , and are divisible by 15 , is equal to _____

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Answer: 21

Solution:

For number to be divisible by 15, last digit should be 5 and sum of digits must be divisible by 3.

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