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Which is the wrong term in the following series? 5          3          6          15        56        275      1644

Which is the wrong term in the following series? 5          3          6          15        56        275      1644 Correct Answer 3

We can observe the pattern:

5 × 1 - 1 = 4 (Not 3)

4 × 2 - 2 = 6

6 × 3 - 3 = 15

15 × 4 - 4 = 56

56 × 5 - 5 = 275

275 × 6 - 6 = 1644

∴ 3 is the wrong term and must be replaced with 4.

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