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OpenStudy (anonymous):
use pascals triangle expand (a+b)^5
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OpenStudy (dumbcow):
you have to use combinations again
OpenStudy (anonymous):
nCr?
OpenStudy (dumbcow):
yep its a pattern 5C0* a^(5-0)b^0 + 5C1*a^(5-1)b^1 + ...
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