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Unformatted text preview: Suppose a  b and c  b a . Prove that c  b and a  b c . [2 points] Question 4b. If a and b are relatively prime integers, prove that gcd( a + b,ab ) = 1 or 2. 4 [5 points] Question 5. Prove that if n is an odd integer, then n 21 must be divisible by 8. 5 [5 points] Question 6. Consider the function f from N \ { 1 } to N deﬁned by f ( n ) = the largest prime divisor of n . (i) Find f ( n ) for each n = 2 , 3 ,..., 10. (ii) What is the range of f ? (iii) Is f onetoone? (iv) Is f onto? (v) Why did we not express f as a function from N to N ? 6...
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 Spring '08
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 Math

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