2 → 7, 4 → 11, 6 → 15. What does 9 give?
A23
B18
C21CORRECT
D19
Common EntranceQuantitative ReasoningNumber Relationships
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Why the answer is C, and why the others tempt you.
Rule: double the number and add 3, so 9 gives 2 x 9 + 3 = 21.
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