Question

How many numbers are thire in 123456??

Answer 1

We have six digits: 1,2,3,4,5,6

Their sum=21.

For a number to be divisible by 3 the sum of the digits must be divisible by 3. As the sum of the six given numbers is 21 (divisible by 3) only 6 digits good to form our 6 digit number would be

16-0={1, 2, 3, 4, 5} and 16-3={ 1, 2, 4, 5,6}.

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