Make 24 from 8, 8, 3 and 3
Using the four numbers 8, 8, 3, 3, each exactly once, together with addition, subtraction, multiplication, division and brackets, make the number 24.
No concatenating digits (no 33 or 88), no exponents, no square roots. This one is famous for how long people search before finding it.
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The trick is to pass through a fraction. Can you make one third, and what would you then divide by it?
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