Study the rows and find the missing number: (3, 4, 11) (5, 2, 9) (6, 3, ?)
A15
B18
C17CORRECT
D19
Common EntranceQuantitative ReasoningNumber Grids
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Why the answer is C, and why the others tempt you.
In each row the first two numbers are multiplied and 1 is taken away: 3 x 4 - 1 = 11, 5 x 2 - 1 = 9, so 6 x 3 - 1 = 17.
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