Question
12   18   31   51   ? Â
 112 What will come in place of the question mark (?) in the following series?Solution
12Â Â Â Â Â Â Â Â 18Â Â Â Â Â Â Â 31Â Â Â Â Â Â Â 51Â Â Â Â Â Â Â 78 Â Â Â Â Â Â 112 Â Â Â Â +6Â Â Â Â Â Â Â Â +13Â Â Â Â Â Â +20Â Â Â Â Â +27Â Â Â Â Â Â +34 Â Â Â Â Â Â Â Â Â +7Â Â Â Â Â Â Â Â +7Â Â Â Â Â Â +7Â Â Â Â Â Â +7
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