Two integers are randomly selected from the set \( \{1,2,3,4,5,6,7,8,9\} \) and are added together. Find the probability that their sum is 15 if they are selected (a) with replacement, (b) without replacement. (a) The probability that their sum is 15 if they are selected with replacement is \( \frac{4}{81} \). (Type an integer or a simplified fraction.) (b) The probability that their sum is 15 if they are selected without replacement is (Type an integer or a simplified fraction.)

Ronaldo comprou 6 numeros de uma nfia sabendo que os 120 numeros da rifa foram vendidos, ance de Ronaldo ganhar a nfa?

Question When a coin is tossed three times, what is the probability that all three tosses are heads? The possible outcomes for the coin tosses are \( \{H H H, T T T, H T T, H H T, T H H, T T H, H T H, T H T\} \) - Express your answer as a simplified fraction.

Question A stack of cards contains six RED cards numbered \( 1,2,3,4,5,6 \), five BLUE cards numbered \( 1,2,3,4,5 \), and four GREEN cards numbered \( 1,2,3,4 \). If a single card is picked at random, what is the probability that the card has an ODD number? - Express your answer as a simplified Fraction Provide your answer below:

fer uma pesquisa coma a turma e organizou os dados obtidos cm uma tabela De acordo ce ual e a probabilidade de Catia sortear uma pessoa da turma e ela usar óculos?

Question You roll a standard die (with the numbers \( \{1,2,3,4,5,6\} \) on its faces). Let \( A \) be the event that you roll an odd number. What is the probability of the event \( A \) ? Give your answer as a simplified fraction.