Question

Check the divisibility of 123456789 by 9..Is this number also divisible by 27 and 81 ..And What is the divisibility rule of 27and 81....!​

Answer 1

Answer:

If the sum of the digits of a number is divisible by 9, then the number is divisible by 9.

therefore 1+2+3+4+5+6+7+8+9 = 45

45 is divisible by 9

therefore 123456789 is divisible by 9

Let a be the hundreds digit of n and let b be the two-digit number formed by the remaining two digits (i.e., the tens digit and the units digit) of n. ... Then n is divisible by 27 if and only if n1 is divisible by 27.

therefore 123456789 is not divisible by 27

That is a number is divisible by 81 iff the sum of its digits is divisible by 81.

therefore 123456789 is not divisible by 81

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