The answer is 6C4 = 6*5/(2*1) = 15
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It is 6!/3! = 6*5*4 = 120 ways
24 ways to make this selection.
50/50
The h can be in any of seven place, the i in any of the remaining six etc etc so 7 x 6 x 5 x 4 x 3 x 2 = 5040 different ways.
Just 1.