Question

Coefficient of x7 in the expansion of (1 – 2x + x3)6 is

Solution

Correct option is

360

 For coefficient of x7,

we have to take p = 1, q = 4 and p = 2, q = 1.

Thus, coefficient of x7

                            

SIMILAR QUESTIONS

Q1

If n > I then value of the expression is

           

Q5
Q6

  

                                                                           

Q8

If A and B are coefficients of xn in the expansions of (1 + x)2n and (1 +x)2n–1 respectively, then A/B is equal to

Q9

The coefficient of xk in the expansion of E = 1 + (1 + x) + (1 + x)2 +…+ (1 + x)n is

Q10

Coefficient of x8 in the expansion of (1 + 2x – x3)6 is