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9,5,6,10.5,23,61,183 find the wrong number in the given series?

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9*0.5 + 0.5 = 5
5*1 + 1 = 6
6*1.5 + 1.5 = 10.5
10.5*2 + 2 = 23
23*2.5 + 2.5 = 60
60*3 + 3 = 183

So 61 is wrong in the series

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Deependra Verma

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