Question

Barbara draws pens randomly from a box containing 5 pens of the same shape and size. There is 1 green pen, 3 red pens, and 1 blue pen. She draws 1 red pen and then another red pen without replacing the first one. Find the probability of drawing 1 red pen followed by another red pen, and show the equation used.

Answer 1

Answer:

total number of pens=5

number of red pens=3

So first time when she draws one red pen,

probability=3/5

Next time when she draws red pene without replacing the first pen, total number of pens becomes 4 and number of red pens becomes 2.

Then probability=2/4=1/2