Question
20Â Â Â Â Â 42Â Â Â Â Â 86Â Â Â Â 174Â Â Â Â Â
?     702 What will come in place of the question mark (?) in the following series?Solution
20 + 22 = 42 42 + 44 = 86 86 + 88 = 174 174 + 176 =Â 350 350 + 352 = 702
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