Whole numbers are defined as the set of non-negative integers, including zero. Thus, whole numbers include 0, 1, 2, 3, 4, etc.
Let's evaluate the sets given in your options:
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Negative 4, one-half, 2, 3, and StartFraction 7 Over 8 EndFraction
- Contains negative (-4) and fractions (1/2 and 7/8). Not all whole numbers.
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StartFraction 1 Over 6 EndFraction, 0, one-fourth, three-fifths
- Contains fractions (1/6, 1/4, and 3/5). Only includes one whole number (0). Not all whole numbers.
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2, 5, 6, 15
- All numbers are whole numbers (2, 5, 6, and 15 are non-negative integers).
Therefore, the set that includes only whole numbers is 2, 5, 6, 15.