Question

There are 30 pens in a box.

12 of the pens are black.
7 of the pens are green.
The rest of the pens are red.
One of the pens is chosen at random.
Find the probability that the pen is red.

Answer 1

30-12=18-7=11 there for the 11
pens that are lefted are red

Answer 2

Explanation:

30-(12-7)= red pens

30-19

11

Probability=

11/30