John and Bob were doing some home construction and decided to take a beer break. Before grabbing a seat John pulls out 3 planks of wood, 1 nail and a hammer. John makes a bet with Bob saying
I'll bet you a beer you can't make a triangle given just these 3 planks and only 1 nail! As an added rule, I must be able to pick it up without it breaking what ever you did.
The nail is only long enough to attach 2 planks of wood together and each plank is of equal size and shape. No other nails or hardware can be used to attach the planks together, only the single nail.
Bob is given no extra tools besides the hammer which is for hitting the nail into any plank.
How can Bob win the bet?
Note: Murder is not allowed! (John was smart and hid his beers first!)
Answer
Bob could just
use the nail to scratch a triangle into one of the planks.
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