Question

If a number id divisible by 3, need it be tested for9? Justify yuor answer by stating any 2 numbers which are divisible by 3 but not by 9?

Answer 1

Answer:

No.. if a number is divisible by 3 then it need not be divisible by 9 because only every third multiple of 3 is a multiple of 9 but the two multiples in the middle are not. Eg. 12 which is divisible by 3 but not 9 and also 33 which is divisible by 3 and not 9

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