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Question

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

A
28
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B
124
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C
215
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D
342
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Solution

The correct option is A 28
Here the number follows the given rule
231,331,431,531,631,731,831
331=26
But 28 has been given in problem series.
so 28 is wrong number.

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