Which of these has the LEAST number of factor pairs? A.6 B.9 C.18 D.19

asked Sep 13, 2018 173k views

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Which of these has the LEAST number of factor pairs?

A.6
B.9
C.18
D.19

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2 votes

d, because 19 is a prime number, so it's only factor pair is 19 and 1

Jchatard answered Sep 14, 2018

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7 votes

6 = 1 x 6, 2 x 3
9 = 1 x 9, 3 x 3
18 = 1 x 18, 2 x 9, 3 x 6
19 = 1 x 19.
Your answer is D.) 19.

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