Question

Solution

Correct option is

– nA

Writing the terms in S in the reverse order, we get

      

Adding (1) and (2) we get

    

⇒   S = – nA

SIMILAR QUESTIONS

Q1

 divided by 7 is

Q2

If in the expansion of (a – 2b)n. the sum of 4th and 5th term is 0, then value of  is

Q3

The coefficient of t50 in (1 + t2)25 (1 + t25) (1 + t40) (1 + t45(1 + t47)……(1) is

 

Q4

 is a polynomial of degree

Q5

 is a polynomial of degree

Q7

If n > I then value of the expression is

           

Q10