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Question

What should come in place of question mark (?) in the following number series?

12           156         256         320         356         ?

A 372 Correct Answer Incorrect Answer
B 412 Correct Answer Incorrect Answer
C 354 Correct Answer Incorrect Answer
D 360 Correct Answer Incorrect Answer
E None of these Correct Answer Incorrect Answer

Solution

12 + 12² = 12 + 144 = 156 156 + 10² = 156 + 100 = 256 256 + 8² = 256 + 64 = 320 320 + 6² = 320 + 36 = 356 356 + 4² = 356 + 16 = 372

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