If ` 13 z4` is a multiple of 6, where z is a digit what might be the value of ?

Explanation

`13z4` is divisible by `6` then it must be divisible by `2` and `3` both.
So, last digit is `4` so divisible by `2`.
For divisibility by `3` sum of digit's must be divisible by `3`.
Sum of digit's`= 8+z`
So, `z= 1, 4, 7`.