Sachin has two coins, one of Rs. 1 denomination and the other of Rs. 2 denomination. He tosses the two coins simultaneously. What is the probability that he gets at least one head?
This are the all possible combinations:
HEAD BACK HEAD HEAD BACK HEAD BACK BACK
Probability is : 3/4 = 0.75
The probability that a girl student gets scholarship is 0.4, and that of a boy is 0.6. What is the probability that at least one gets the scholarship?
Three coins are tossed in the air and two of the coins land with heads face upwards. What are the chances on the next toss of the coins that at least two of the coins will land with heads face upwards again?
A fair coin is tossed until a head comes up for the first time. What is the probability of this happening on an odd number tosses?
A box contains 4 blue, 3 red, 5 green and 6 yellow marbles. If three marbles are drawn at random, what is the probability that at least one is green?
An integer from 299 through 1000 both inclusive, is to be chosen at random. What is the probability that the number chosen will have 2 as at least one of its digit?
