aha-vol17

“Einstein’s Riddle”

It’s rumored that Albert Einstein made up this logic puzzle and that he claimed that 98% of the population could not solve it. Are you among the 2%?

There are 5 houses, each of a different color. Each of their owners has a unique heritage, drinks a certain type of beverage, smokes a certain brand of cigarette, and keeps a certain variety of pet. None of the owners have the same variety of pet, smoke the same brand of cigarette, or drink the same beverage.

• The Brit lives in the red house.

• The Swede keeps dogs as pets.

• The Dane drinks tea.

• Looking from the front, the green house is just to the left of the white house.

• The green house’s owner drinks coffee.

• The person who smokes Pall Malls raises birds.

• The owner of the yellow house smokes Dunhills.

• The owner of the center house drinks milk.

• The Norwegian lives in the leftmost house.

• The owner who smokes Blends lives next to the one who keeps cats.

• The owner who keeps a horse lives next to the one who smokes Dunhills.

• The owner who smokes Blue Masters also drinks beer.

• The German smokes Princes.

• The Norwegian lives next to the blue house.

• The owner who smokes Blends has a neighbor who drinks water.

Who owns the pet fish?

Michael H. Pryor

Michael H. Pryor

Michael H. Pryor is the co-founder and president of Fog Creek Software. He runs a technical interview site at techinterview.org


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