An organisatiion has n employees. If a committee needs to be fformed from among the employees ncluding at least tow employees and also excluding at least two employees. The number of ways of forming the committee is (A) `2^n-n-1` (B) `2^n-2n-4` (C) `2^n-2n-2` (D) `2^n-2n`

The number of terms in the expansion of (x+1/x+1)^n is (A) 2n (B) 2n+1 (C) 2n-1 (D) none of these

The number of employees in a nationalised bank in a small town is 10, out of which 4 are female and the rest are males. A committee of 5 is to be formed. If m be the number of ways to form such a committee in which there is atleast one female employee and n be the no. of ways to form such a committee which includes at least two male employees, then find the ratio m : n.

Number of ways of forming a team consisting of at least 2 and atmost (n-2) students from n students is

In an office there were initially n employees. The HR manager first hired p% employees, then after a month q% employees left the office, then there were finally n employees remained in the office, the value of p-q is :

The sum of first n odd natural numbers is 2n-1 (b) 2n+1 (c) n^2 (d) n^2-1

The sum of n terms of a series is An^(2)+Bn then the n^(th) term is (A) A(2n-1)-B(B)A(1-2n)+B(C)A(1-2n)-B(D)A(2n-1)+B

If n is a negative number then which of the following is the least? 0 (b) n(c)2n (d) n^(2)

The mean of first n odd natural number is (a) (n+1)/2 (b) n/2 (c) n (d) n^2