Many of you may have done something similar before.

You are given four numbers, and you must use each number **exactly** once. You may only use multiplication, division, addition and subratction and parentheses. You must come up with expression that equals 24. 'Joining' numbers is not allowed, for example if you had a 1 and a 3, you may not simply join then to make 13, or 31. Exponentials are no allowed. This includes roots and recipricals.

So the challenge is, make 24 from these sets of numbers

1 2 3 4

1 2 3 5

1 2 3 6

1 2 4 5

1 2 4 6

1 2 5 6

1 3 4 5

1 3 4 6

1 3 5 6

1 4 5 6

2 3 4 5

2 3 4 6

2 3 5 6

2 4 5 6

3 4 5 6

Out of those, 1346 is by far the most difficult. I'll post the people who have solved each one next to it.

Banx99, stay away please.