Question
5Â Â Â 3Â Â Â 4Â Â Â 7.5Â Â Â 17Â Â Â
 ?    138 Find the missing number in the following number series:Solution
5 x 0.5 + 0.5 = 3Â 3 x 1 + 1 = 4Â 4 x 1.5 + 1.5 = 7.5 7.5 x 2 + 2 = 17Â 17 x 2.5 + 2.5 = 45 Â 45 x 3 + 3 = 138
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