How to find the sum of all possible subsequences multiplication of the array?

Revision en1, by Ehsan_sShuvo, 2017-11-26 15:35:56

How could i solve this problem.Please help me to solve this problem. Thanks in advance :)

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en1 English Ehsan_sShuvo 2017-11-26 15:35:56 225 Initial revision (published)