Question
121Â Â Â Â Â 127Â Â Â Â Â Â 133Â Â Â Â Â Â
142Â Â Â Â Â Â 160Â Â Â Â Â Â 206 In each of the following questions a number is wrong in the series. Find out the wrong number.Solution
121          127          133          142          160         205         +6             +6             +9           +18        +45                 ×1            ×1.5           ×2           ×2.5
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