Study the rows and find the missing number: (2, 3, 13) (4, 1, 17) (3, 2, ?)
A12
B5
C25
D13CORRECT
Common EntranceQuantitative ReasoningNumber Grids
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Why the answer is D, and why the others tempt you.
In each row the first two numbers are squared and added: 2² + 3² = 13, 4² + 1² = 17, so 3² + 2² = 13.
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