There are 24 combinations if you use each digit only once per combination: 123 124 132 134 142 143 213 214 231 234 241 243 312 314 321 324 341 342 412 413 421 423 431 and 432.
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from 100 to 999 it is 900
27 three digit numbers from the digits 3, 5, 7 including repetitions.
24 of them. So we have a 2 or 6 in the unit position, therefore (2)(4)(3) = 24 even three-digit numbers, can be formed.
125 There are five choices for each of the three digits (since repetition is allowed). So there are 5*5*5=125 combinations.
There are only 999 three digit whole numbers.