can you explain step by step please in easy words

a. Events A and B are independent. P(A)= 0.5, P(B)=0.4 i. Compute ( ) ii. Compute P(A'|B') b. Imagine rolling a fair dice 3 times and calculating the proportion p of the rolls that result in the sum of the outcomes to be 15 after 3 rolls. What is the probability of p? c. Between two friends Ella and Bella, the chance of Ella getting admission to a specific school is 70% and that of Bella is 80%. Their applications are evaluated independently. i. What is the probability that only Ella gets admission? ii. What is the probability that only Bella gets admission? iii. What is the probability that both gets admission?