### Home > MC2 > Chapter 3 > Lesson 3.1.2 > Problem 3-23

Mr. Hill has a deck of math flashcards that include addition, subtraction, and multiplication problems. Twenty-five cards show addition problems,

What is the probability of drawing a card with an addition or subtraction problem on it?

If Mr. Hill adds

division flashcards to the deck, what will P(division) be? In the new deck, which is greater: the probability of drawing an addition or subtraction flashcard, or the probability of drawing a multiplication or division flashcard?

**Justify**your conclusion.

Since you know how to get the probability of drawing an addition or a subtraction problem separately, how could you get the probability of drawing either an addition or subtraction problem in one draw?

Try adding the separate probabilities together. Does this make sense? Why?

If the

How many total cards are in the deck now?

Remember,

Out of the new deck with the

Drawing a multiplication or division card is more likely. Why is this the answer?