Question
51Â Â Â Â Â 53Â Â Â Â Â 109Â Â Â Â Â 332Â Â Â Â
 ?     6686 What will come in place of the question mark (?) in the following series?Solution
51 x 1 + 2 = 53 53 x 2 + 3 = 109 109 x 3 + 5 = 332 332 x 4 + 7 =Â 1335 1335 x 5 + 11 = 6686
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