Practice GMAT Data Sufficiency Question
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What is the value of (n + 1)^{2}?
 n^{2}  6n = 9
 (n1)^{2} = n^{2} – 5
Correct Answer: D

Evaluate Statement (1) alone.
 Try to solve for n:
n^{2}  6n = 9
n^{2}  6n + 9 = 0
(n  3)^{2} = 0
n  3 = 0
n = 3
With one value for n, we can find a single value for (n + 1)^{2}  Statement (1) alone is SUFFICIENT.
 Try to solve for n:

Evaluate Statement (2) alone.
 Expand the terms and simplify them:
n^{2}  2n + 1 = n^{2} – 5
2n + 1 = 5
2n + 6 = 0
6 = 2n
n = 3
With one value for n, we can find a single value for (n + 1)^{2}  Statement (2) alone is SUFFICIENT.
 Expand the terms and simplify them:
 Since Statement (1) alone is SUFFICIENT and Statement (2) alone is SUFFICIENT, answer D is correct.
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