Question
21Â Â Â 11Â Â Â 12Â Â Â 19.5Â Â Â 41Â Â Â
 ?    318 Find the missing number in the following number series:Solution
21 x 0.5 + 0.5 = 11Â 11 x 1 + 1 = 12Â 12 x 1.5 + 1.5 = 19.5 19.5 x 2 + 2 = 41 41 x 2.5 + 2.5 = 105 Â 105 x 3 + 3 = 318
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