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Unformatted text preview: 1.2 # 2 3. 1.2 # 5 4. 1.2 # 7 (B) 1. 1.2 # 12 (Hint: If the rectangle has side lengths a and b , it might be useful to think about dierent ways you can write a in terms of b .) 2. 1.2 # 13. Note that in (a) it should be =  ab  , and in (b) it should be =  ab  /d . 3. Challenge problem: 1.2 # 20. Specically, when gcd( a,b ) = 1, determine an integer N such that it is possible to pay all postages greater than N cents, and then prove that it is possible to pay all postages greater than N cents. The integer N will be expressible via a formula in terms of a and b (e.g., one formula in terms of a and b is 3 ab + 5, though this isnt the correct formula for this problem). Additional practice problems: 1.2 # 6, 8, 9, 11, 14, 15, 21 These problems will not be collected, but cover material that you will be responsible for knowing. 1...
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 Spring '08
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 Algebra, Geometry

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