Learn about Probability of Events at Multiple Favourable Outcomes Find probability: So this problem, it tells us to use a number cube to find the probability of tossing a one and four. Before we begin, let’s talk about probability. Probability is the likelihood that a given event will occur. It can be expressed as a number greater than or equal to zero and it could be less than or equal to one. The possible outcomes on a number dice or a number cube are one, two, three, four, five and six. These possible outcomes are called sample space. So these possible outcomes are called sample space. All outcomes have the same chance of happening, so they are equally likely. When something is equally likely that means that they have the same chance of happening. When the possible outcomes of a probability experience are equally likely, you can express probability as a fraction. To find the probability, probability of an event = number of favorable outcomes/number of possible outcomes. There are two favorable outcomes. We are looking to toss 1 or 4. We have two favorable outcomes, so numbers of favorable outcomes are two. There are two ways of getting a one and four or two ways to getting our outcomes one or four. We have two favorable outcomes. There are six possible outcomes. We have six possible outcomes. Our probability of event will be two which is our number of favorable outcomes over six, our possible. Our probability will be 2/6. The probability of getting a 1 or 4 is 2/6 which you can also write as P(1 or 4) the probability of getting a 1 or 4, 2/6. Remember that probability is a measure of the likelihood that a given event will occur. It can be expressed as a number greater than or equal to 0 or less than or equal to one. A probability of an event will equal the number of favorable outcomes over the number of possible outcomes. Remember that an event is a set of outcomes to which a probability is assigned, so to set of outcomes that our probability is assigned. Remember that a sample space is a list of all your possible outcomes.