Binomial mania! (JEE mains question)
Probability
Level
pending
In the expansion of (a+b)^n , n >=5, the sum of 5th and 6th terms is zero. Then a/b equals,
6/(n-5)
(n-5)/6
(n-4)/5
5/(n-4)
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1 solution
Let n=5 because without putting n=5 we cant get 6th term ., 6th term = (5c5)( b^5) 5th term = (5c4)(a)(b^4) By equating 5th and 6th term, We get a/b= 1/5 And in the options put n=5