Depends what you're asking. If all 4 letters have to be involved, that's very different than if you can have combos of 3,2, or 1. Also if they have to make a word then that's a different question that should be posed in the English category. If however, it is merely how many 4 letter combinations can you make of those 4 letters, then it is 24. Found by 4! which is merely 4x3x2x1.
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black and white adding another color will make grey with a shade of that color but B&W will be neutral gray.
W*D=w*d
let me break it down for you, 7 days (d) = 1 week (w) 7(d) =1(w) 7(d) X 3 =21(d) =3(w) Answer: 21 days to 3 weeks.
W = F x d W = Work F = Force d = Distance
212 D at which W B - 212 degrees at which water boils.