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The second, third and fourth terms in t...

The second, third and fourth terms in the binomial expansion `(x+a)^n`are 240, 720 and 1080, respectively. Find x, a and n.

A

15

B

20

C

10

D

55

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The correct Answer is:
d
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OBJECTIVE RD SHARMA ENGLISH-BINOMIAL THEOREM AND ITS APPLCIATIONS -Exercise
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  2. If the coefficients of three consecutive terms in the expansion of (1+...

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  3. The second, third and fourth terms in the binomial expansion (x+a)^na...

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  4. The value of tan75

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  5. If the coefficients of the (2r+4)t h ,(r+2)t h term in the expansion o...

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

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  7. The 14^(th) term from the end in the expansion of (sqrt(x ) - sqrt(y)...

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  8. If [x] denotes the greatest less than or equal to x and F = R - [R]...

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  9. If [x] denotes the greatest integer less then or equal to x, then ...

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  10. If n in N such that (7 + 4 sqrt(3))^(n) = I + F , then IF is

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  11. Find n in the binomial (2^(1/3)+1/(3^(1/ 3)))^n , if the ration 7th te...

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  12. The sum of the coefficients in (1+x-3x^2)^2143 is

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  13. If the sum of the coefficient in the expansion of (alpha^2x^2-2alphax+...

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  14. Find the sum of coefficients in the expansion of the binomial (5p -...

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  15. If the sum of the coefficients in the expansion of (1-3x+10 x^2)^ni sa...

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  16. In the expansion of (1 + x)^(2n)(n in N), the coefficients of (p +1...

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  17. Write the coefficient of the middle term in the expansion of {(x+y^3)^...

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  18. The coefficient of x^5 in the expansion of (1+x^2)(1+x)^4 is (a) 12 (b...

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  19. If the coefficients of r^(th) and (r+1)^(th)terms in expansion of (3+7...

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  20. If there is a term containing x^(2r) in (x + (1)/(x^(2)))^(n-3), then

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