Question
 In the given figure, select the number which can be
placed at the sign of question mark (?) from the given alternatives. ÂSolution
For the first: 3 × 1 × 5 × 2 = 30, which is close to 31 (off by 1) For the second: 4 × 6 × 3 × 2 = 144, which is close to 145 (off by 1) So the missing center value would be: 2 × 7 × 5 × 1 + 1 = 70 + 1 = 71
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