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If 2nd, 3rd and 4th tems in the expansio...

If 2nd, 3rd and 4th tems in the expansion of `(x+y)^n` be 240,720 and 1080 respectively, find x,y and n.

Answer

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

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

Knowledge Check

  • Find the 4^(th) term in the expansion of (x-2y)^(12) .

    A
    `176 x^(9) y^(3)`
    B
    `1760 x^(9) y^(3)`
    C
    `-1760 x^(9) y^(3)`
    D
    None of these

  • Find the r^(th) term in the expansion of (1+x)^(2n) .

    A
    `""^(2n) C_(r) x^(r)`
    B
    `""^(2n) C_(r-1) x^(2n -r)`
    C
    `""^(2n) C_(r-1) x^(r-1)`
    D
    `""^(2n) C_(r)`

  • The 4^(th) term in the expansion of (x-2y)^(12) is

    A
    `1760 x^(8) y^(6)`
    B
    `-440 x^(7) y^(5)`
    C
    `- 1760 x^(9) y^(3)`
    D
    None of these

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    If 3rd,4th, 5th terms in the expansion of (a+x)^(n) be 84,280 and 560, Find x, a and n .

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    If the 3^(rd) , 4^(th) and 5^(th) terms in the expansion of (x + a)^(n) are 84, 280 and 560 respectively then find the values of a, x and n.

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