A box contains $10$ red marbles, $20$ blue marbles and $30$ green marbles. $5$ marbles are drawn from the box, what is the probability that all will be blue?

Vedclass pdf generator app on play store
Vedclass iOS app on app store

Total number of marbles $=10+20+30=60$

Number of ways of drawing $5$ marbles from $60$ marbles $=^{60} C_{5}$

All the drawn marbles will be blue if we draw $5$ marbles out of $20$ blue marbles.

$5$ blue marbles can be drawn from $20$ blue marbles in $^{20} C_{5}$ ways.

$\therefore$  Probability that all marbles will be blue $\frac{{^{20}{C_5}}}{{^{60}{C_5}}}$

Similar Questions

Let $n$ be the number of ways in which $5$ boys and $5$ girls can stand in a queue in such a way that all the girls stand consecutively in the queue. Let $m$ be the number of ways in which $5$ boys and $5$ girls can stand in a queue in such a way that exactly four girls stand consecutively in the queue. Then the value of $\frac{m}{n}$ is

  • [IIT 2015]

Let a die be rolled $n$ times. Let the probability of getting odd numbers seven times be equal to the probability of getting odd numbers nine times. If the probability of getting even numbers twice is $\frac{ k }{2^{15}}$, then $k$ is equal to:

  • [JEE MAIN 2023]

If $m$ rupee coins and $n$ ten paise coins are placed in a line, then the probability that the extreme coins are ten paise coins is

Let $A$ and $B$ be two finite sets having $m$ and $n$ elements respectively such that $m \le n.\,$ A mapping is selected at random from the set of all mappings from $A$ to $B$. The probability that the mapping selected is an injection is

When a missile is fired from a ship, the probability that it is intercepted is $\frac{1}{3}$ and the probability that the missile hits the target, given that it is not intercepted, is $\frac{3}{4}$. If three missiles are fired independently from the ship, then the probability that all three hit the target, is

  • [JEE MAIN 2021]