Question
11Â Â Â Â Â 28Â Â Â Â 47Â Â Â Â 70Â Â Â Â Â
?      130 What will come in place of the question mark (?) in the following series?Solution
11 + 17 = 28 28 + 19 = 47 47 + 23 = 70 70 + 29 =Â 99 99 + 31 = 130
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