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Environmentalists are suggesting the 4th...

Environmentalists are suggesting the 4th R along with 3’R’s. Explain.

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Knowledge Check

  • If alpha, beta, gamma are roots of the equation x^(3) + qx + r = 0 and S_(r ) denotes the sum of the r the powers of the roots of the equation then 3S_(2) S_(5) =

    A
    `S_(3) S_(4)`
    B
    `2S_(3)S_(4)`
    C
    `4S_(3)S_(4)`
    D
    `5S_(3)S_(4)`

  • In Delta ABC with usual notation, observation the two statements given below I)r r_1 r_2 r_3=Delta^2 II) r_1 r_2+r_2 r_3+r_3 r_1=s^2 Which of the following is correct?

    A
    Both I and II are true
    B
    I is true, II is false
    C
    I is false, II is true
    D
    Both I and II are false

  • The equation of the plane passing through (3, 4,-2) and whose normal has the d.r.'s (2, 3, 4) is

    A
    3x + 4y + 5z + 20 = 0
    B
    3x + 4y + 5z – 20 = 0
    C
    x – 2y – 3z + 20 = 0
    D
    2x – 3y + 4z + 14 = 0

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    If the coefficients of (2r+4)^("th") term and (3r+4)^("th") term in the expansion of (1+x)^(21) are equal, find r.

    The coeffcients of the (r-1)^(th) , r^(th) and (r+1)^(th) terms in the expansion of (x+1)^n are in the ration 1 : 3: 5 Find n and r.

    In DeltABC, if sqrt(3)r+a= sqrt(3)r+b=s then the triangle is

    If the coefficients of (2r+1)th term and (4r+5)th term in the expansion of (1+x)^10 are equal then r=

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