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Write down any two-digit number (different digits and no zero) and then express that number by writing the same 2 digits in reverse order, with or without arithmetical signs. For example, 45 = 5 x 9 would be correct if only the 9 had happened to be a 4. Or 81 = (1 +8)2 would do, except for the fact that it introduces a third figure-the 2.
The mathematical sign you can use are addition, subtraction, multiplication, division, square root(√ ), decimal points, and the factorial sign (!) (For example 4! = 4 x 3 x 2 x 1 = 24).There are more than one answer for this puzzle.
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