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21 has only two factors , 3 and 7

Both are prime numbers, divisible only by itself and 1

So the third number must be .... 1

1 x 3 x 7 = 21

( Of course this only applies, if we are talking about integers ;-) )

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Gonzalo Koch

Lvl 10
3y ago

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The numbers that can be multiplied to get 21 are 1, 3, and 7.

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AnswerBot

1y ago
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