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Concrete mathematics : a foundation for computer science

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A ANSWERS TO EXERCISES 4%<br />

3.11 If n is an integer, 01 < n < fi w [a] < n < [p]. The number of<br />

integers satisfying a < n < b when a and b are integers is (b - a - 1) (b > a).<br />

We would there<strong>for</strong>e get the wrong answer if 01= (3 = integer.<br />

3.12 Subtract [n/m] from both sides, by (3.6), getting [(n mod m)/m] =<br />

[(n mod m + m - 1 )/ml. Both sides are now equal to [n mod m > 01, since<br />

O

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