COMEDK · Maths · 36. Probability
An urn contains 9 balls, 2 of which are white, 3 blue and 4 black. 3 balls are drawn at random from the urn. The chance that 2 balls will be of the same colour and the third of a different colour is
- A \(\frac{45}{84}\)
- B \(\frac{55}{84}\)
- C \(\frac{35}{84}\)
- D \(\frac{25}{84}\)
Answer & Solution
Correct Answer
(B) \(\frac{55}{84}\)
Step-by-step Solution
Detailed explanation
Let \(E_{1}, E_{2}\) and \(E_{3}\) be the the events such that drawn ball is white, blue and black respectively. The required probability…
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Maths
- If \(A(\operatorname{adj} A)=\left[\begin{array}{ccc}-2 & 0 & 0 \\ 0 & -2 & 0 \\ 0 & 0 & -2\end{array}\right]\), then \(|\operatorname{adj} A|\) equalsCOMEDK 2021 Easy
- The derivative of \(a^{\sec x}\) w.r.t. \(a^{\tan x}(a>0)\) isCOMEDK 2016 Medium
- The point of intersection of the lines \(\dfrac{x-1}{2}=\dfrac{y-2}{3}=\dfrac{z-3}{4}\) and \(\dfrac{x-4}{5}=\dfrac{y-1}{2}=z\) isCOMEDK 2021 Easy
- The maximum of the function \(3 \cos x-4 \sin x\) isCOMEDK 2013 Easy
- \(\mathrm{P} \text { is a point on the line segment joining the points }(3,2,-1) \text { and }(6,2,-2) \text {. If the } x \text { co ordinate of } \mathrm{P} \text { is } 5 \text {, then its } \mathrm{y} \text { coordinate is }\)COMEDK 2023 Easy
- The angle between the vectors \(\mathrm{a}=\hat{\mathrm{i}}+2 \hat{\mathrm{j}}+2 \hat{\mathrm{k}}\) and \(\mathrm{b}=\hat{\mathrm{i}}+2 \hat{\mathrm{j}}-2 \hat{\mathrm{k}}\) isCOMEDK 2023 Easy
More PYQs from COMEDK
- Two particles, one heavy and the other light, placed at 50 cm from each other, are under the influence of gravitational force of one another. If mass of the heavier particle is 4 kg and its acceleration under the influence of gravitational force is \(5 \times 10^{-10}\ ms^{-2}\), find the mass of the lighter particle.COMEDK 2026 Easy
- For the reaction,
\(2 \mathrm{MnO}_4^{-}+b \mathrm{C}_2 \mathrm{O}_4^{2-}+c \mathrm{H}^{+} \rightarrow x \mathrm{Mn}^{2+}+y \mathrm{CO}_2+z \mathrm{H}_2 \mathrm{O}\)
Find \(b, c, x, y\) and \(z\)COMEDK 2025 Medium - The area of the region bounded by the curve \(y^2=2 y-x\) and the \(y\)-axis isCOMEDK 2025 Medium
- - The locus of the mid-points of the line joining the focus and point on the parabola \(y^{2}=4 a x\) is a parabola with the equation of directrix asCOMEDK 2019 Hard
- Consider a Galvanic cell in which the following reactions occurs: \(\text{Fe}^{2+}(aq) + \text{Ag}^+(aq) \rightarrow \text{Fe}^{3+}(aq) + \text{Ag}(s)\). What is the standard potential of the cell? Given: \(E^0_{(\text{Ag}^+/\text{Ag})} = aV\), \(E^0_{(\text{Fe}^{2+}/\text{Fe})} = bV\) & \(E^0_{(\text{Fe}^{3+}/\text{Fe})} = cV\)COMEDK 2026 Medium
- Four masses each 2 kg are placed at the corners A, B, C, D of a mass less square frame. 40 kg mass is at the centre O of a square frame of side 0.2m. It is to be rotated about an axis passing through the centre O and perpendicular to the plane of the frame. Calculate the torque in N-m required to produce an angular acceleration of \(\dfrac{\pi}{2}\ rads^{-2}\).COMEDK 2026 Medium