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Unformatted text preview: d ( a-a 1 + a 2-a 3 + + (-1) l a l ) . 5. (a) Prove that a positive integer is divisible by 8 if and only if the three-digit integer formed by its nal three digits is divisible by 8. (b) Determine all pairs of digits ( a,b ) such that 27 b 9 a 4 is divisible by 72. 1...
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- Winter '08