Question

if 81z2 is a multiple of 3. when z is a digit. what is the value of z​

Answer 1

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the number is 81z2.

As it is a multiple of 3, it is divisible by 3.

So,

8+1+z+2 = 3k (k is constant)

11 + z = 3k

For z to be smallest 3k = 12,

11+z=12

z=1

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