Question
7Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 26Â Â Â Â
       63           126          215      342 Find out the wrong number in the following given number series :Solution
2³ - 1 = 7 3³ - 1 = 26 4³ - 1 = 63 5³ - 1 = 124 6³ - 1 = 215 7³ - 1 = 342
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