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## Question

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#### SIMILAR QUESTIONS

Q1

Value (s) of x for which the fourth term in the ex pansion of  is 40 is (are)

Q3

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

Q4

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

Q5

then n must be equal to

Q6

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

Q7

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

Q8

Coefficient of x9 in the expansion of

Q9

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

Q10

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