Q80.A bag contains 6 balls. Two balls are drawn from it at random and both are found to be black. The probability that the bag contains at least 5 black balls is (1) 5 (2) 2 7 7 3 5 (3) (4) 7 6
What This Question Tests
This question requires calculating the shortest distance between two skew lines in 3D using their vector or Cartesian forms and then using this information to check which coordinate relation is not possible for a point on one of the lines.
Concepts Tested
Formulas Used
Shortest distance = |(a2-a1).(b1xb2)| / |b1xb2|
Parametric equation of a line (x,y,z) = (x1+λl, y1+λm, z1+λn)
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📋 Question Details
- Chapter
- 3D Geometry
- Topic
- Shortest distance between skew lines
- Year
- 2023
- Shift
- 31 Jan Shift 1
- Q Number
- Q80
- Type
- MCQ
- NCERT Ref
- Class 12 Mathematics Ch 11: Three Dimensional Geometry
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