What is the best way to approach this question? I have a hard time organizing combination questions.
Seems to be ETS material, but clearly not the Big Book.
Notice that there are many ways we can satisfy the 10 books requirement - for instance 2 bio and 8 novels, 3 bio and 7 novels and 4 bio/6 novels. Consider each case separately and add them up.
umm you post twice
2+ biographies is the key information here, so we have 3 cases 4C2*6C2+4C3*6C1+4C4*6C0=115
Thank you. Sorry, I messed up. This question came from ETS’s OG.
Thank you. Yeah, I don’t know why the question posted twice. Didn’t mean to do that.
Sisi your answers are always detailed so thank you!
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