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Is \(b\) even?

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Re: Is \(b\) even?

by gmatter2012 » Sat Aug 22, 2020 6:59 am

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Gmat_mission wrote: ↑
Sat Aug 22, 2020 3:28 am
 Is \(b\) even?

(1) \(\dfrac{a}{b}\) is even.

(2) \((a+1)b\) is even.

Answer: E

Source: Veritas Prep

With due respect I think OA may be wrong .
(1) \(\dfrac{a}{b}\) is even.
\(\frac{10}{5\ }\)=2 Here b is odd
\(\frac{12}{6}\) =2 Here b is even
INSUFF.

(2) \((a+1)b\) is even.
\(b\) could be even
or
\((a+1)\) could be even and b could be odd
INSUFF.

1+2
From (1) we know a is even hence \((a+1)\) is odd
From (2) if\((a+1 )\)b is even then b is even.


Ans-C

Hope I have not missed anything.!
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