Numbers .

sanju09: GMAT Instructor; Posts: 3650; Joined: Wed Jan 21, 2009 4:27 am; Location: India; Thanked: 267 times; Followed by:80 members; GMAT Score:760

by sanju09 » Thu May 03, 2012 4:56 am

kullayappayenugula wrote:If the sum of 25 distinct prime numbers is even, then ____ is always one of them.

1. 2
2. 3
3. 5
4. 7

2 is always one of them. Reason being that the remaining 24 primes are all odd, and would add up to some even number x; and then x + 2 is yet another even.

The mind is everything. What you think you become. -Lord Buddha

Sanjeev K Saxena
Quantitative Instructor
The Princeton Review - Manya Abroad
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www.manyagroup.com

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