Question
217Â Â Â Â 210Â Â Â Â Â 236Â Â Â Â Â 299Â Â Â Â Â
423Â Â Â Â 640 In each of the following questions a number is wrong in the series. Find out the wrong number.Solution
217 + (23Â - 1) = 210 210 + (33Â - 1) = 236 236 + (43Â - 1) = 299 299 + (53Â - 1) = 423 423 + (63Â - 1) =Â 638
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