Find the probability of getting HEAD at least once on tossing a coin twice. The probability of an event is able to be said to be equal to the total number of favorable outcomes divided by the total number of outcomes only in the case that it is known that the outcomes are equally likely to occur. If three marbles are drawn from the jar at random what is the probability that the first marble is red the second marble is blue and the third is white.
Therefore the chances of getting an even number upon rolling a dice is 05.
P A B P AB P B. What is wrong with my probability formula. Statistics and probability SL and HL 9 HL only 10 Topic 5. Here sample space S HH HT TH TT H denotes Head and T denotes Tail.