Is a even?

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Vincen: Legendary Member; Posts: 2898; Joined: Thu Sep 07, 2017 2:49 pm; Thanked: 6 times; Followed by:5 members

by Vincen » Tue Oct 03, 2017 4:48 pm

Is a even?

(1) 2a is even.
(2) âˆša is even.

The OA is B.

How can I use the square root to know that a is even?

Source: Beat The GMAT — Data Sufficiency | Tue Oct 03, 2017 4:48 pm

Jay@ManhattanReview: GMAT Instructor; Posts: 3008; Joined: Mon Aug 22, 2016 6:19 am; Location: Grand Central / New York; Thanked: 470 times; Followed by:34 members

by Jay@ManhattanReview » Tue Oct 03, 2017 11:13 pm

Vincen wrote:Is a even?

(1) 2a is even.
(2) âˆša is even.

The OA is B.

How can I use the square root to know that a is even?

(2) âˆša is even => a = (even)^2 = even*even = even

The correct answer: B

Hope this helps!

-Jay

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