21y5 is a multiple of 3 then value of y is=
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since 21y5 is a multiple of 3 then the Sum of digits will be divisible by 3,
then
sum of digits=2+1+y+5,
=8+y,
so it's clear then minimum value of y should be 1 so that sum of the digits become 9 and which is divisible by 3
then
sum of digits=2+1+y+5,
=8+y,
so it's clear then minimum value of y should be 1 so that sum of the digits become 9 and which is divisible by 3
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