3Â Â Â Â Â Â Â Â Â Â Â Â Â Â 25Â Â Â Â Â Â Â Â Â Â Â 173Â Â Â Â Â Â Â Â Â 1041Â Â Â Â Â Â Â 5201Â Â Â Â Â Â Â 20809
10       a              b             c              d             e
What would come in place of b?
The above series go in the following sequence. 3 × 8 + 1 = 25 25 × 7 – 2 = 173 173 × 6 + 3 = 1041 1041 ×5 – 4 = 5201 5201 × 4 + 5 = 20809 Hence, the resulting series would be: 108156533931696167849
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