CBSE Class 11-science Answered
thank you sir!!!!
but in the first one,, if we have to find 1/x
then why n-r =1 why not n-r=-1
And answer is (2n)!/ [(n-1)!(n+1)!]
Asked by Nirbhay | 06 Nov, 2014, 09:42: AM
Expert Answer
Answered by Prasenjit Paul | 07 Nov, 2014, 10:33: AM
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