“Determine probability that a purchase is paid for by debit card OR credit card given that the customer paid over $100 for it” [2 events and 1 condition]
“Compute the probability that a child survives an accident given that the child is either 3 OR 4 years old.” [ 1 condition, 2 events]
My question is, how is this handled? What formula should I use? What is the notation? The OR really throws me off because I know OR means addition rule and in conditional probability, one must use multiplication rule.