Question
21Â Â Â Â Â 84Â Â Â Â Â Â 168Â Â Â Â Â Â
172     ?     348 What will come in place of the question mark (?) in the following series?Solution
21 + 4 = 84 84 x 2 = 168 168 + 4 = 172 172 x 2 =Â 344 344 + 4 = 348
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