Question

Use 4 fours to make 10. You can only use 4's four times. Use addition, subtraction, multiplication, division, parentheses, etc.

Answer 1

Using only the given operations, it is not possible to make 10.

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The possible non-negative integers are:

{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 12, 15, 16, 17, 20, 24, 28, 32, 36, 48, 60, 64, 68, 80, 128, 256}