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Calculate:

\[\large 1+2-3-4+5+6-7-8+9+...-99-100\]

Puzzle with five cards (red, yellow,green, blue, purple), each with 16 numbers on it (number from 1-31). Solvers can ...

If you begin with a one-digit number, multiply it by 3, then add 8, then divide by 2 and then subtract 6, you will get the original number back.

What ...

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