Show that only one of the numbers n, n + 2 and
n + 4 is divisible by 3.
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Here's the punchline: habits mediate the relationship between an individual's desires and their environment. To change the habit, the individual, the environment, or both have to change, and that's why self-discipline is so hard.
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n+2 = 3q+2+2 =3q+4 = 3(q+1)+1 is not divisible by 3. n+4 = 3q+2+4 = 3q+6 = 3(q+2) is divisible by 3. thus one and only one out of n , n+2, n+4 is divisible by 3.
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