BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem

Integers

This topic has expert replies
Post new topic Post Reply
Previous Topic Next Topic
Junior | Next Rank: 30 Posts
Posts: 29
Joined: Tue Dec 23, 2008 11:42 am
Thanked: 1 times

Integers

by bburton11 » Thu Jun 18, 2009 8:46 am
If n is a postive interger, which of the following must be an even interger?

n+1
n+2
n^2+2
n^2+n
n^2+2n

answer is n^2+n
Top
Source: — Problem Solving |
Master | Next Rank: 500 Posts
Posts: 148
Joined: Wed Jun 03, 2009 8:04 pm
Thanked: 18 times
Followed by:1 members

by ghacker » Thu Jun 18, 2009 9:12 am
take any two consecutive integers , they differ by one hence one is odd and the other is even .If you multiply the two you always get an even number

if n is an integer then n and n+1 are consecutive integers
when you multiply n and n+1 you should get an even number

n*(n+1) = even ------------n^2+n is even
Top
Post new topic Post Reply
• Page 1 of 1