MATH 4200 Midterm: MATH 4200 LSU Fall 16 Exam 1a

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31 Jan 2019
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Answer each of the questions on your own paper, and be sure to show your work so that partial credit can be adequately assessed. Put your name on each page of your paper: [15 points] let = 715 and = 546. (a) calculate the greatest common divisor = gcd(, ). Thus, = gcd(715, 546) = 13. (b) write in the form + for some integers and . Reverse the above calculations to write as a linear combination: = 169 4(546 3 169) = 13 169 4 546. Thus 13 = 13 715 17 546. (c) calculate the least common multiple lcm(, ). = 30030: [20 points] use induction to prove that the equation. =1 (4 1) = 22 + is valid for all integers 1. Note that expanding the summation, the equation is. 3 + 7 + 11 + + (4 1) = 22 + .

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