7Â Â Â Â Â Â Â Â Â Â Â Â Â Â 41Â Â Â Â Â Â Â Â Â Â Â 207Â Â Â Â Â Â Â Â Â 825Â Â Â Â Â Â Â Â Â 2479Â Â Â Â Â Â Â 4953
12       a              b             c              d             e           Â
What would come in place of b?
The above series go in the following sequence. 7 × 6 – 1 = 41 41 × 5 + 2 = 207 207 × 4 – 3 = 825 825 × 3 + 4 = 2479 2479 × 2 - 5 = 4953 Hence, the resulting series would be: 12   71357    142542798553
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