showing 1-10 of 66 questions, sorted newest to the oldest, all questions, category : probability
There are $4$ boys and $4$ girls. They sit in a row randomly. What is the chance that all the girls do not sit together.
a bag contains $3$ red, $6$ white and $7$ blue balls. What is the probility that two balls drawn are white and blue?
a bag contain $5$ blue and $4$ black balls. Three balls are drawn at random. What is the probability that $2$ are blue and $1$ black?
A building contractor knows that the probability of rain in his region during any given day in August is $30\%$. He has $2$ days work remaining on the job and there are $4$ days during which the work can be done without incurring penalty costs. If he gets no work done on rainy days, what is the probability that he will pay penalty? Assume that rain on any given day is independent of the fact that it did or did not rain on any other day.
A and B stand in a line at random with $10$ other people. What is the probability that there are exactly $3$ people between A and B?
If a card is selected from a set of $52$ cards knowing that it is not a Jack, find out the conditional probability that it is black coloured.
Six married couples are standing in a room. If four people are chosen at random, find the probability that exactly one married couple is among the four.
There are $3$ boxes containing respectively $1$ white, $2$ red, $3$ black balls; $2$ white, $3$ red, $1$ black balls; $3$ white, $1$ red and $2$ black balls. A box is chosen at random and from it two balls are drawn at random. the two balls are $1$ red and $1$ white. What is the probability that they come from the second box?