if a number is divisible by 3 it must be divisible by 9
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it's not necessary..... take an example of 15 it is divisible by 3 but not divisible by 9
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no all that divisibleby 3 it must be divisible by 9 because some numbers are 3,6,12,15,21 etc. are not disable by 3 or not to9.
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