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Quantitative Aptitude
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17 21 12 28 ? 39

Question

17 21 12 28 ?

39 What should come in place of question mark '?' in the following number series?

A 5 Correct Answer Incorrect Answer

B 9 Correct Answer Incorrect Answer

C 3 Correct Answer Incorrect Answer

D 7 Correct Answer Incorrect Answer

E None of these Correct Answer Incorrect Answer

Solution

17 + 2² = 21 21 - 3² = 12 12 + 4² = 28 28 - 5² = 3 3 + 6² = 39

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