Question

If 21y5 is a multiple of 3 then find the least value of y

Answer 1

Divisible rule of 3 :- If the sum of the digits of the number is divided by 3 then the number is also divisible by 3.

2+1+y+5= 8+y

so the y value is 1 i.e, 8+1 = 9 . 9 is divisible by 3 so the number is also divisible by 3

so the least value is 1

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