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OpenStudy (anonymous):
Find the coefficient of x5 in the expansion of (x - 1)^9
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OpenStudy (sriram):
126?
OpenStudy (anonymous):
126
OpenStudy (anonymous):
use pascal's triangle or binomial theorem
OpenStudy (anonymous):
126 agree
OpenStudy (anonymous):
\[\dbinom{9}{4}=126\]so everyone agrees
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