0 votes 0 votes e Q) The number of positive integers satisfying the inequality are ________ $^{n+1}C_{(n-2)} + ^{n+1}C_{(n-1)}\leq 90$ getting n= 1 to 9 so answer should be 9 but answer given is 8 (2 to 9) Operating System maths + – Vertika Srivastava asked Jan 24, 2016 edited Jan 26, 2016 by ibia Vertika Srivastava 397 views answer comment Share Follow See all 4 Comments See all 4 4 Comments reply saurav04 commented Jan 24, 2016 reply Follow Share in ncr r>=0 if take n =1 then in (n+1)C(n-2) n-2 becomes -1 2 votes 2 votes Praveen Saini commented Jan 24, 2016 reply Follow Share yes , I think same as above 1 votes 1 votes Vertika Srivastava commented Jan 24, 2016 i edited by Vertika Srivastava Jan 24, 2016 reply Follow Share Thank you sourav and sir I missed that check - 0 votes 0 votes Praveen Saini commented Jan 24, 2016 reply Follow Share I think it is " $r \geq 0$ " 0 votes 0 votes Please log in or register to add a comment.