GMAT Patterns Explained — A set of numbers has the property that for any number t

A set of numbers has the property that for any number t in the set, t + 2 is in the set. If -1 is in the set, which of the following must also be in the set? I. -3 II. 1 III. 5

patternssequences & series

Explanation	Calculations	Help
$We apply the given property to t = - 1 to find the next number in the set$	$- 1 + 2 = 1$
$We apply the given property to t = 1 to find the next number in the set$	$1 + 2 = 3$
$We apply the property again to t = 3 to find the next number in the set$	$3 + 2 = 5$
$Statement I requires going backwards (subtracting 2), but the property only guarantees adding 2, not subtracting$	$- 1 - 2 = - 3$	Theory & Tactics Method Card LOGIC1-A Click to view full details

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D. II and III only