Question

without actual division check divisibility of 51 by 3

Answer 1

5+1=6 and 6 is divisible by 3
so 51 is divisible by 3..
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Answer 2

hey!!

for any number to be divisible by 3
the sum of digits of that number must be divisible by 3

here for 51 sum is 5+1=6 which is divisible by 3 so the number is divsible by 3


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Thanks !!