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From module Arithmetic and Number Theory Basics
When finding the sum 12+13+14+15+16+17\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+\frac{1}{5}+\frac{1}{6}+\frac{1}{7}21+31+41+51+61+71, the least common denominator used is
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