Find the values of r in the following equation.
15Cr=15C(2r)
Thx~
Binomial coefficients~ (20)
2011-06-06 8:01 am
回答 (2)
2011-06-06 8:07 am
✔ 最佳答案
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2011-06-06 16:43:06 補充：
Sorry,更正
3r=15 or r=2r
r=5 or r=0
2011-06-07 12:38 am
there is no need to reject r=2r as it would imply r=0, which satisfies the equation.
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