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If the coefficient of rth term and (r+1)...

If the coefficient of `rth` term and `(r+1)^(th)` term in the expansion of `(1+x)^(20)` are in ratio `1:2`, then `r` is equal to

A

6

B

7

C

8

D

9

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AAKASH INSTITUTE-BINOMIAL THEOREM-Assignment (section-A)
  1. A binomial is

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  2. The expansion (a+x)^(n) = .^(n)c(0)a^(n) + ^(n)c(1)a^(n-1)x + ………… + ....

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  3. If the coefficient of rth term and (r+1)^(th) term in the expansion of...

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  4. When n is any postive integer,the expansion (x+a)^(n) = .^(n)c(0)x^(n)...

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  5. If n is a positive integer, then the number of terms in the expansion ...

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  6. The term independent of x in the expansion of (2x+1/(3x))^(6) is

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  7. The 6th term of expansion of (x-1/x)^(10) is

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  8. The number of the terms which are not similar in the expansion of (L+M...

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  9. The exponent of x occuring in the 7th term of the expansion of ((ax)/2...

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  10. The term containing a^(3)b^(4) in the expansion of (a-2b)^(7) is

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  11. The term independent of x in the expansion of (x-3/x^(2))^(18) is

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  12. In the expansion of (x^(3)-2/x^(2))^(12), fifth term from the end is

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  13. If m and n are positive integers, then prove that the coefficients of ...

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  14. The number of terms in expansion of {(a+4b)^(3)(a-4b)^(3)}^(2) is

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  15. If r^(th) term in the expansion of (x^(2)+1/x)^(12) is independent of ...

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  16. The non zero terms in the expansion of (1+3sqrt(2)a)^(9)+(1-3sqrt(2)a)...

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  17. In the expansion of (2+1/(3x))^(n), the cofficient of x^(-7) and x^(-...

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  18. In in the expansion of (1+px)^(q), q belongs to N, the coefficients of...

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  19. The expansion of (x^(alpha)+1/x^(beta))^(n) has constant term, if

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  20. The number of rational terms in the expansion of ((25)^(1/3) + 1/(25)^...

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