Divisibility/Multiples/Factors

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swerve: Legendary Member; Posts: 2343; Joined: Sun Oct 29, 2017 2:04 pm; Followed by:6 members

Divisibility/Multiples/Factors

by swerve » Sun Jul 02, 2023 1:42 pm

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If $6$ is a factor of a and $21$ is a factor of $b$, is $ab$ a multiple of $70$?

1) $a$ is a multiple of $4$
2) $b$ is a multiple of $15$

The OA is B

Source: Princeton Review

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