Question

If 2576a456b is divisible by 15 then what is value of a

Answer 1

As it is divisible by 5 b=

To be divisible by 3,the sum of numbers must be 3or multiple of 3

2+5+7+6+4+5+6+5+a=40+a=4+0+a

4+a=6(As it is the nearest number of 3)

a=2

So a-b=2-5=-3

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