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How many ways are there to assign each of 7 friends to either the chemistry class or the biology class if one of these six, Manoj, refuses to be in a class without any of his friends?

 Nov 28, 2020
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Maybe you can see here: https://web2.0calc.com/questions/i-got-8-possibilities-it-is-incorrect and derive the answer from that...

 Nov 28, 2020

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