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If the 2nd, 3rd and 4th terms in the expansion of `(x+a)^n` are 240, 720 and 1080 respectively, find `x ,\ a ,\ ndot`

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RD SHARMA ENGLISH-BINOMIAL THEOREM-All Questions
  1. If the coefficients of three consecutive terms in the expansion of (1+...

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  2. If the 6th, 7th, 8th terms in the expansion of (x+ y)^n be 112, 7 and ...

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  3. If the 2nd, 3rd and 4th terms in the expansion of (x+a)^n are 240, ...

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  4. Find a, b and n in the expansion of (a+b)^n if the first three t...

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  5. If p is a real number and if the middle term in the expansion of (p/2+...

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  6. Write the number of terms in the expansion of (2+sqrt(3)x)^(10)+(2-sqr...

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  7. Write the middle term in the expansion of ((2x^2)/3+3/(2x^2))^(10)dot

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  8. Which term is independent of x in the expansion of (x-1/(3x^2))^9?

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  9. If a\ a n d\ b denote respectively the coefficients of x^m a n d\ x^n ...

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  10. Write the middle term in the expansion of (x+1/x)^(10)dot

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  11. If a\ a n d\ b denote the sum of the coefficients in the expansions of...

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  12. Write the coefficient of the middle term in the expansion of (1+x)^(2n...

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  13. Find the sum of the coefficient of two middle terms in the binomial ...

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  14. If a\ a n d\ b are the coefficients of x^n in the expansions of (1+x)^...

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  15. The total number of terms in the expansion of (x+a)^100+(x-a)^100 is:

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  16. If (1-x+x^2)^n=a0+a1x+a2x^2+ .........+a(2n)x^(2n),\ find the value o...

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  17. If the rth term in the expansion of (1+x)^20 has its coefficient equal...

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  18. The term without x in the expansion (2x-1/(2x^2))^(12) is a. 495 b. -4...

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  19. If rth term in the expansion of (2x^2-1/x)^(12) is without x then r is...

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  20. If in the expansion of (a+b)^n\ a n d\ (a+b)^(n+3) , the ratio of the...

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