Question
9Â Â Â Â 20Â Â Â Â Â 63Â Â Â Â Â Â 255Â Â Â Â Â Â
1285Â Â Â Â Â 7716 In each of these questions a number series is given. In each series only one number is wrong. Find out the wrong number.Solution
9 x 2 + 2 = 20 20 x 3 + 3 = 63 63 x 4 + 4 =Â 256 256 x 5 + 5 = 1285 1285 x 6 + 6 = 7716
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