Which is the wrong number in the series?

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ശ്രേണിയിലെ തെറ്റായ സംഖ്യ ഏത്?

7, 28, 63, 124, 215, 342, 511

A7

B124

C28

D215

Answer:

C. 28

Read Explanation:

2³ - 1 = 7 3³ - 1 = 26 4³ - 1 = 63 5³ - 1 = 124 6³ - 1 = 215 7³ - 1 = 342 8³ - 1 = 511

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