Detective deduction
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What you will learn
By the end, you can solve a who-has-what puzzle by crossing out what the clues rule out, one step at a time.
Detective Sana finds three lunch boxes on a bench: one red, one blue, one green. Nobody remembers whose is whose, but there are clues. “Mine is not red,” says Tomas. “Mine is not red or blue,” says Yuki. Sana does not guess. She crosses out what cannot be true until only one answer is left.
Read the explanation
Deduction means working out what must be true from the clues. Read one clue at a time and cross out every option it rules out. When only one option is left in a row, that answer is fixed, and it rules out that option for everyone else. “If… then” clues work the same way: if the first part is true, the second part must be true too.
- One clue at a time: cross out what it rules out.
- One option left in a row? Lock it in, and cross it out for everyone else.
- “If A then B”: when A is true, B must be true as well.