Question
31Â Â Â 40Â Â Â 51Â Â Â 64Â Â Â 79Â Â Â
 ? What will come in place of the question mark (?) in the following series?Solution
31 + 9 = 40 40 + 11 = 51 51 + 13 = 64 64 + 15 = 79 79 + 17 = 96
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