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JEE Advanced2006MathematicsProperties of TrianglesActual

Match the following.

Options

  1. A(i) (a), (ii) (b), (iii) (c)
  2. B(i) (b), (ii) (a), (iii) (c)
  3. C(i) (a), (ii) (c), (iii) (b)
  4. D(i) (b), (ii) (c), (iii) (a)

Correct answer

B. (i) (b), (ii) (a), (iii) (c)

Step-by-step solution

aligned & (i) _ i=1 ^ ⁻¹ ( 1 2 i^2 )=t _ i=1 ^ ⁻¹ ( 2 4 i^2-1+1 ) & _ i=1 ^ ⁻¹ (2 i+1)-(2 i-1) 1+(2 i-1)(2 i+1) & ( ⁻¹ 3- ⁻¹ 1 )+ ( ⁻¹ 5- ⁻¹ 3 )+ + ⁻¹(2 n+1)- ⁻¹(2 n-1) & t= _ n ( ⁻¹(2 n+1)- ⁻¹ 1 )= _ n ⁻¹ ( 2 n 1+2 n+1 )= 4 & t=1 . aligned (ii) We have, ₁= 1- ^2 ₁ 2 1+ ^2 ₂ 2 = a b+c ^2 2 = b+c-a b+c+a Also, ₃= 1- ^2 ₃ 2 1+ ^2 ₃ 2 = c a+b ^2 ₃ 2 = a+b-c a+b+c ^2 ₁ 2 + ^2 ₃ 2 = 2 b a+b+c = 2 b 3 b = 2 3 , [as, a, b, c are in AP 2 b=a+c ] (iii) Line through (0,1,0) and perpendicular to plane x+2 y+2 z=0 is given by

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