Unit 12 · Multi-Step Conditional Reasoning
Card Set — Which Statement Must Be True?
Lesson 24 of 30
About this lesson
15 cards, 3 shapes, numbers 1–9, no two identical. One constraint: only the number 7 appears in both a square and a circle. Which statement must be true? The answer requires working out the maximum possible for squares and circles combined — then subtracting.
Chapters
Question
Each card in a set of fifteen cards has one of three shapes on it: a triangle, a square or a circle. Inside the shape a number from 1 to 9 is written. No two cards are identical.
The only number that appears in both a square and a circle is 7.
Which one of the following statements must be true?
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