shown in the pairs

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

by sanju09 » Sat Jul 24, 2010 3:21 am

Which of the following describes the relationship between A and B as shown in the pairs of numbers in the table below?
A. B = A + 4
B. B = 2 A + 1
C. B = 3 A - 1
D. B = AÂ² + 1
E. B = AÂ² - 1

[spoiler]Source: majortests.com[/spoiler]

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Source: Beat The GMAT — Problem Solving | Sat Jul 24, 2010 3:21 am

selango: Legendary Member; Posts: 1460; Joined: Tue Dec 29, 2009 1:28 amFollowed by: 7 members; Thanked: 135 times

by selango » Sat Jul 24, 2010 3:28 am

Choose first pair and check with the options

A=2 and B=5

Options B,C and D work.

Choose second pair

A=3,B=10

Option D alone work.

Pick D

Quick approach:

If we closely look A and B,it ll in B=A^2+1

--Anand--

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