Question
217 210 236 299
423 640 In each of the following questions a number is wrong in the series. Find out the wrong number.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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