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If the coefficient of the `2^(nd)`,`3^(rd)` and `4^(th)` terms in the expansion of `(1 + x)^(n)` are in A.P, then n=

A

7

B

4

C

5

D

6

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The correct Answer is:
D
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NEW JOYTHI PUBLICATION-BINOMIAL THEOREM-QUESTIONS FROM COMPETITIVE EXAMS
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  3. The number of terms in the expansion of (1 + 5sqrt(2)x)^(9) + (1 - 5sq...

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  5. The coefficient of x^(-9) in the expansion of (x^(2)/2 - 2/x)^(9) is

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  6. If the coefficients of the r^(th) term and the (r + 1)^(th) term in th...

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  7. If (1 + ax)^(n) = 1 + 6x + 27/2 x^(2) + ...... + a^(n)x^(n), then the ...

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  8. If x = (729 + 6(2)(243) + 15(4)(81) + 20(8)(27) + 15(16)(9) + 6(32)3 +...

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  14. If (2x^(2) - x - 1)^(5) = a(0) + a(1)x + a(2)x^(2) + ....... + a(10)x^...

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  15. If (1 + x - 3x^(2))^(10) = a(0) + a(1)x + a(2)x^(2) + ....... + a(20)x...

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  16. (i) What is the second term in the expansion of (1 + x)^(n)? (ii) Wr...

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  19. Prove that ""^(10)C(2)+2xx^(10)C(3)+^(10)C(4)=^(12)C(4)

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  20. Let f (x) = [x] , where [x] denotes the greater integer less t...

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