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## Question

### Solution

Correct option is

nx

Multiplying by x and putting a = 1 – x, we get, the sum of series as nx

#### SIMILAR QUESTIONS

Q1

then n must be equal to

Q2

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

Q3

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

Q4

Coefficient of x9 in the expansion of

Q5

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

Q7

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

Q8

If a = 99100,  b = 10099, then

Q9

If α Ïµ [– 1, 1] and I(α) denotes the term independent of x in the expansion of

exceed