Question
21Â Â Â Â 23Â Â Â Â 49Â Â Â Â 152Â Â Â
 ?     3086 What will come in place of the question mark (?) in the following series?Solution
21 x 1 + 2 = 23 23 x 2 + 3 = 49 49 x 3 + 5 = 152 152 x 4 + 7 =Â 615 615 x 5 + 11 = 3086
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