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Find the wrong number in the series 7, 28, 63, 124, 215, 342, 511

Correct Answer: 28

Explanation:

Here the number follows the given rule 


  2 3 - 1 ,   3 3 - 1 ,   4 3 - 1 ,   5 3 - 1 ,   . . .


 


But 28 has been given in problem series.


 


so 28 is wrong number.


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