It is a question of statistics. The probability of an event is equal to the ratio of favorable outcomes to the possible outcomes.

Let A be the even the that a card selected is red card.

Let B be the event that the card selected is a queen.

Total number of possible outcomes is 52.

n(S)= 52

n(A)= 13

n(B)= 4

n( A and B)= 1

P(A)=n(A)/n(S)= 13/52

P(B)= n(B)/n(S)= 4/52

P(A and B)=P(A intersection B)= 1/52

Let A be the even the that a card selected is red card.

Let B be the event that the card selected is a queen.

Total number of possible outcomes is 52.

n(S)= 52

n(A)= 13

n(B)= 4

n( A and B)= 1

P(A)=n(A)/n(S)= 13/52

P(B)= n(B)/n(S)= 4/52

P(A and B)=P(A intersection B)= 1/52