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If a natural number is divisible by 7, then it must also be divisible by 21.

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Anonymous
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  1. not true
    e.g. 35 is divisible by 7 but not by 21

    But ....
    "If a natural number is divisible by21 , then it must also be divisible by 7" is true.

    Can you see the logic behind the last statement ?

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    Reiny

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