Marty has exactly 5 blue pens, 6 black pens, and 4 red pens in his knapsack. If he pulls out one pen at random from his knapsack, what is the probability that the pen is either red or black?

Question

dan815 · Answer

hello

dan815 · Answer

how many red or black pens are there?

dan815 · Answer

how many total numbers of pens are there?

dan815 · Answer

so what would hte probability of picking red or black pens out of the total pens be

anonymous · Answer

Probability of something is always, (value of something)/(value of total possibilities)