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Common Prime Factors

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Common Prime Factors [#permalink]  15 Mar 2019, 11:27
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Question Stats:

100% (00:27) correct 0% (00:00) wrong based on 1 sessions
How many factors greater than one, do 120, 210 & 270 have?

a. 1
b. 3
c. 7.
d. 12.
e. Infinite
[Reveal] Spoiler: OA

Last edited by Carcass on 15 Mar 2019, 11:44, edited 1 time in total.
Fixed OAs
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Re: Common Prime Factors [#permalink]  15 Mar 2019, 11:43
Expert's post
$$120 = 12 x 10 = 2^2 x 3 x 5$$

$$210 = 21 x 10 = 2 x 3 x 5 x 7$$

$$270 = 27 x 10 = 2 x 3^2 x 5$$

just take out the common factors from above

2,3,5,6,10,15,30

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Re: Common Prime Factors   [#permalink] 15 Mar 2019, 11:43
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