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# Help On Questions

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1) In the arrangement below, each number is the non-negative difference of the two numbers above it to which it is attached. What is the sum of the four greatest distinct possible values for z?

2)Among all fractions  $$x$$that have a positive integer numerator and denominator and satisfy$$\frac{9}{11} \le x \le \frac{11}{13}$$

which fraction has the smallest denominator?

Guest Oct 1, 2018
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