Question
420Â Â Â Â 342Â Â Â Â Â 272Â Â Â Â Â 212Â Â Â Â Â
156Â Â Â Â 110 In each of the following questions a number is wrong in the series. Find out the wrong number.Solution
212 – 21 = 420 192 – 19 = 342 172 – 17 = 272 152 – 15 = 210 132 – 13 = 156 112 – 11 = 110
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