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OpenStudy (anonymous):
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OpenStudy (anonymous):
|dw:1367124652898:dw|
OpenStudy (anonymous):
why -1 ?
OpenStudy (anonymous):
Do not have the option of not choosing, so you substract one
OpenStudy (anonymous):
ok, thks
OpenStudy (anonymous):
Are you sure it's 2^5 - 1? @Luis_Rivera
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OpenStudy (anonymous):
Each ingredient can be dealt with in 2 ways, it can be chosen or not chosen.
OpenStudy (anonymous):
but at least one salad must be made, so that means 1 less option
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