Question #d4d25
1 Answer
Explanation:
Assuming we are starting with a full deck of 52 cards, the probability of picking a spade the first time is just the ratio of spades to other suits:
The probability of the second one occurring AFTER the first one is a "conditional probability". It is the product of the two individual probabilities in sequence, divided by the probability of the first event.
If A and B are two events such that given event B has happened and we have to find the probability of event A, then probability of A given B, denoted by P(A/B) is given by
P(A/B) = P(A∩B)/P(B)
where P(A∩B) = P(A)x P(B)
http://www.probabilityformula.org/conditional-probability-formula.html