anonymous
  • anonymous
In an used book store, there are some different mystery novels on a shelf. Suppose there are 64 different ways to buy these novels, including not buying them. How many mystery novels are there on the shelf? The answer is 6! Does anyone know how to do the question though?? Thanks so much!
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
lets say there are \(n\) novels you could buy none \(_nC_0=1\) way to do that you could buy 1 \(_nC_1\) ways to do that you could buy 2 \(_nC_2\) ways
anonymous
  • anonymous
then you would add them up when you add, you get \(2^n\)
anonymous
  • anonymous
one way to think of it is adding the entries in the \(n\)th row of pascals triangle gives you \(2^n\) and since \(2^n=64\) you know \(n=6\)

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anonymous
  • anonymous
OH thanks so much! that makes perfect sense!!
anonymous
  • anonymous
yw

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