Question

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

6 2 8 ? 84 416

A 16 Correct Answer Incorrect Answer
B 18 Correct Answer Incorrect Answer
C 15 Correct Answer Incorrect Answer
D 20 Correct Answer Incorrect Answer
E 22 Correct Answer Incorrect Answer

Solution

6 × 1 - 2² = 2 2 × 2 + 2² = 8 8 × 3 - 2² = 20 20 × 4 + 2² = 84 84 × 5 - 2² = 416

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