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Question: Answered & Verified by Expert
A plane P is parallel to two lines whose direction ratios are -2,1,-3, and -1,2,-2 and it contains the point 2,2,-2. Let P intersect the co-ordinate axes at the points A,B,C making the intercepts α,β,γ. If V is the volume of the tetrahedron OABC, where O is the origin and p=α+β+γ, then the ordered pair V,p is equal to
MathematicsThree Dimensional GeometryJEE MainJEE Main 2022 (28 Jul Shift 2)
Options:
  • A 48,-13
  • B 24,-13
  • C 48,11
  • D 24,-5
Solution:
1757 Upvotes Verified Answer
The correct answer is: 24,-13

Given a plane P is parallel to two lines whose direction ratios are -2,1,-3, and -1,2,-2,

So normal of plane P is given by, i^j^k^-21-3-12-2=4i^-j^-3k^

Now equation of plane P which passes through 2,2,-2 will be,

4x-2-y-2-3z+2=0

4x-y-3z-12=0

Now, coordinates of plane making intercepts at X,Y & Z axis will be  A3,0,0,B0,-12,0,C0,0,-4

α=3,β=-12,γ=-4

p=α+β+γ=-13

Now finding volume of tetrahedron OABC

V=16OA·OB×OC=163i^·-12j^×-4k^

V=163i^·48i^=8×3=24

So, V,p=24,-13

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