An urn contains 60 blue pens and 40 red pens. Half of the pens of each

1.	An urn contains 60 blue pens and 40 red pens. Half of the pens of each one isdefective. If one pen is chosen at random, what is the probability that it is adefective or a red pen?
Answer» Probability = possible outcomes / total outcomes Probability of defective pen= (30 + 20)/100= 1/2 Probability of red pen= 40/100= 2/5 Probability pen is defective or red = 1/2 + 2/5 = (5 + 4)/10= 9/10

An urn contains 60 blue pens and 40 red pens. Half of the pens of each one isdefective. If one pen is chosen at random, what is the probability that it is adefective or a red pen?

Answer»

Probability = possible outcomes / total outcomes

Probability of defective pen= (30 + 20)/100= 1/2

Probability of red pen= 40/100= 2/5

Probability pen is defective or red = 1/2 + 2/5 = (5 + 4)/10= 9/10