Suppose we want to choose 4 colors, without replacement, from 17 distinct colors.(If necessary, consult a list of formulas.)(a) How many ways can this be done, if the order of the choices is taken into consideration?(b) How many ways can this be done, if the order of the choices is not taken into consideration?
Question
Suppose we want to choose 4 colors, without replacement, from 17 distinct colors.(If necessary, consult a list of formulas.)(a) How many ways can this be done, if the order of the choices is taken into consideration?(b) How many ways can this be done, if the order of the choices is not taken into consideration?
Solution
(a) If the order of the choices is taken into consideration, we use the permutation formula. The number of ways to choose 4 colors from 17 is given by P(17,4) = 17! / (17-4)!. This equals 171615*14 = 58,410 ways.
(b) If the order of the choices is not taken into consideration, we use the combination formula. The number of ways to choose 4 colors from 17 is given by C(17,4) = 17! / [4!(17-4)!]. This equals 17161514 / (4321) = 2,380 ways.
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