Question

In each of the following questions a number is wrong in the series. Find out the wrong number.

217     210       236       299      423     640

A 640 Correct Answer Incorrect Answer
B 236 Correct Answer Incorrect Answer
C 423 Correct Answer Incorrect Answer
D 210 Correct Answer Incorrect Answer
E None of these Correct Answer Incorrect Answer

Solution

217 + (23 - 1) = 210 210 + (33 - 1) = 236 236 + (43 - 1) = 299 299 + (53 - 1) = 423 423 + (63 - 1) =  638

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