Question

Find out the wrong number in the following given number series :

7                    26             63             126            215       342

A 342 Correct Answer Incorrect Answer
B 26 Correct Answer Incorrect Answer
C 126 Correct Answer Incorrect Answer
D 215 Correct Answer Incorrect Answer
E 63 Correct Answer Incorrect Answer

Solution

2³ - 1 = 7 3³ - 1 = 26 4³ - 1 = 63 5³ - 1 = 124 6³ - 1 = 215 7³ - 1 = 342

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