Question 62 - Math Practice Test for the SAT Exam

The ancient Egyptians used symbols representing fractions with 1 as the numerator. To make other fractions, they would add these symbols. One useful combination is:

\[\frac{1}{b}+\frac{1}{b(ab-1)}\]

What fraction does this give us?

\[\frac{a}{ab+1}\]
\[\frac{2}{ab^2}\]
\[\frac{a}{ab-1}\]
\[\frac{ab}{ab-1}\]

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