1.solve the following equations,where n is a positive integer.
a ) nCn-3 = 120
b ) C2+nC1+nC0 =22
2. simplify
a ) (n+2)! / n * n!
b ) n! + (n-1)!
c )1/ (n - 1)! - 6/ (n+1)!
3.Find the value of n ,where n is a positive integer ,if the 1st term in the
expansion of (5x-2)^n in ascending powers of x is 64.
thx...!!><
F.4 ..m2 maths..
2010-09-25 10:59 pm
回答 (1)
2010-09-25 11:17 pm
✔ 最佳答案
As follows:圖片參考：http://i707.photobucket.com/albums/ww74/stevieg90/20-8.jpg
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