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19-02-2017
Mathematics

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Which equation correctly multiplies only prime numbers and has a product of 18?
a. 2 x 9=18
b.3 x 3 x 3=18
c. 2 x 2 x 3=18
d.2 x 3 x 3=18?

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Аноним Аноним

19-02-2017

a prime number has no factors other than itself or 1.

eg 3 is a prime number but 9 is not because 9 = 3*3.

so a is incorrect
the other 3 options all contain prime numbers but only one multiplication is correct

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