Question

Coefficient of xn in the expression (1 – 2x + 3x2 – 4x3 +…)n equals

Solution

Correct option is

SIMILAR QUESTIONS

Q2

If x2r occurs in  then n – 2r must be of the form

Q3

If the coefficient of rth, (r + 1)th and (r  + 2)th terms are in A.P., then n is a root of the equation

Q4

 

 then n must be equal to

Q5

If in the expansion of (21/3 + 3–1/3)n, the ratio of the 7th term from the beginning to the 7th terms from the end is 1: 6, then n is equal to

Q6

If sum of the coefficients of x7 and x4 in the expansion of 

Q7

Coefficient of x9 in the expansion of 

Q8

If three successive coefficient in the expansion of (1 + x)n are in A.P., then (n + 2) is

Q10

If a = 99100,  b = 10099, then