Asked by  | 9th Sep, 2008, 09:19: PM

Expert Answer:

n+1cr and ncr+1 both are positive so (k2-3) 0 i.e. | k | 3

and also n+1r and nr+1  ==>  nr+1   and r0

(k2-3) = n+1cr /  ncr+1 = (n+1) (r+1) / (n+1-r) (n-r)

(n+1)  / (n+1-r) 1 and (r+1) / (n-r)  (r+1)  1

(k2-3) can be greater then 1 or less then 1 depending on the values of n and r

so option c is incorrect. and a,b,d are right answers.




Answered by  | 17th Dec, 2008, 01:11: AM

Queries asked on Sunday & after 7pm from Monday to Saturday will be answered after 12pm the next working day.