Question

A box contains 18 green marbles and 8 white marbles. If the first marble chosen was a white marble, what is the probability of choosing, without replacement, another white marble?

Answer 1

7/25

Explanation:

Original contents of the box:

18 green marbles

8 white marbles

Contents of the box after drawing 1 white marble:

18 green marbles

7 white marbles

Total: 25 marbles

p(white) = (number of white marbles)/(total number of marbles)

p(white) = 7/25