if a number is divisible by 3 and 7 it must be divisible by 21
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no it is not true
plzz make it brainly
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The Divisibility Rule for 21 is used to determine if a number is divisible by 21. You can also call it the test of divisibility for 21. To determine if a number is divisible by 21, take the last digit and multiply it by 2. Then subtract that from the rest of the number.
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