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The index of a in the 12th term of the e...

The index of a in the 12th term of the expansion of `(a+2b)^20` is

A

a) 8

B

b) 7

C

c) 9

D

d) 10

Text Solution

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The correct Answer is:
C
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PATHFINDER-BINOMIAL THEOREM AND PRINCIPLE OF MATHEMATICAL INDUCTION-QUESTION BANK
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  2. The index of a in the 12th term of the expansion of (a+2b)^20 is

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  3. The number of terms in the expansion of (x+y)^5 is

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  4. The total number of terms in the expansion of (1+2x+x^2)^2 is

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  5. In the expansion of (1+x)^n, coefficient of rth term from end is

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  6. The middle term in (2x-3y)^12 is

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  7. If n is a positive integer, then ^nC1+^nC2+....+^nCn is equal to

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  8. if the coefficients of x^7 & x^8 in the expansion (2+x/3)^n are equal ...

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  9. The coefficient of x^(-10) in the expansion of (x^2-1/x^3)^10 is

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  10. If a1, a2 are the coefficients of x^n in the expansion of (1+x)^(2n) &...

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  11. The coefficient of x^(10) in the expansion of 1+(1+x)+(1+x)^2+.....+(1...

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  12. The sum of the coefficients of the terms of the expansion of (3x-2y)^n...

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  13. The coefficient of the middle term of the expansion of (1-2x+x^2)^n is

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  14. The sum of the coefficients in the expansion of (1-2x+2x^2)^(2014) is

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  15. The middle term of the expansion of (4x+5y)^18 is

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  16. The value of (^8C1+^8C2+^8C3+....+^8C8) is

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  17. The value upto 3 decimal place of (0.999)^3 is (applying Binomial Theo...

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  18. Find the 10th term of (2x^2+1/x)^12.

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  19. If rth term in the expansion of (x+1/x)^10 is independent of x, then f...

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  20. Find the middle term in the expansion of (x-1/(2y))^10.

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