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Mathematics - 3D Coordinate Geometry Question with Solution | TestHub

Mathematics3D Coordinate GeometryPlane (Equations)Medium2 minPYQ_2021

MathematicsMediumsingle choice

An urn contains 9 balls of which 3 are red, 4 are blue and 2 are green. Three balls are drawn at random from the urn. The probability that the three balls have difference colours is

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Answer:

Solution:

$Required probability = \frac{^{3} C _{1} \times ^{4} C _{1} \times ^{2} C _{1}}{^{9} C _{3}} = \frac{3 \times 4 \times 2}{( \frac{9 !}{3 ! 6 !} )} = \frac{24 \times 6}{9 \times 8 \times 7} = \frac{2}{7}$

Stream:MHT_CETSubject:MathematicsTopic:3D Coordinate GeometrySubtopic:Plane (Equations)

⏱ 2mℹ️ Source: PYQ_2021

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