Question

A box contains 20 cards marked with numbers 1 to 20. One card is drawn at random. Event A is the number of the card which is multiple of 5. Write S, n(S), A and n(A).

Answer 1

S = {1,2,3,4,.......20}

n(S) = 20

A = The number on the card is multiple of 5

A = {5,10,15,20}

n(A) = 4