practice problem

Which of the following is not a property associated with probability mass functions (pmf)? The probabilities of all elements in the range of a random variable can sum to greater than O A pmf takes an element x from the range of a random variable and returns a number between O and 1 O If x is not a member of the range of a random variable. then it gets the probability O O The probability of each element x in the range of a random variable is the sum of the probability of all the elements from S that map to each x