Question

A jar contains 3 black marbles, 4 white marbles and 5 striped marbles. If a marble is picked at random, what is the probability that it is black? Give your answer as a fraction in lowest terms.

Answer 1

1/4

Explanation:

# of black marbles/ total # of marbles

3/(3+4+5)

3/12

1/4

Answer 2

1/4

Explanation:

3 black marbles, 4 white marbles and 5 striped marbles. = 12 marbles

P(black) = number of black / total

=3/12

=1/4