A number is chosen at random from 40 and 50 inclusive. Find the probability that the number is prime.
The Venn diagram above shows the number of students offering physics and chemistry in a class of 65. What is the probability that a student selected from the class offers physics and chemistry if every students offers at least one subject?
A bag contains 7 red and 4 black identical balls. Two balls were picked at random from the bag and replaced each time. Find the probability the two balls were of same colour.
Find the probability of getting an even number in a single throw of a six-sided die.
If the probability of death is q and the probability of survival is p, find the probability of one death and one survival in an accident involving two persons
