Let . Define the empty product to be . For every subset of , multiply its elements together and add up the resulting numbers; what is the result?

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- March 19th 2010, 10:39 AMBruno J.An easy problem!
Let . Define the empty product to be . For every subset of , multiply its elements together and add up the resulting numbers; what is the result?

- March 19th 2010, 02:38 PMproscientia
__Spoiler__: - March 19th 2010, 04:05 PMBruno J.
Good!

Here's my solution :

__Spoiler__: - March 20th 2010, 08:55 AMfunnyname7
Thanks Bruno.