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Rule of three/Q/1/Exercise
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Suppose that a linear function
φ
:
Q
⟶
Q
{\displaystyle \varphi \colon \mathbb {Q} \longrightarrow \mathbb {Q} }
has for
11
13
{\displaystyle {}{\frac {11}{13}}}
the value
7
17
{\displaystyle {}{\frac {7}{17}}}
. What is its vale for
3
19
{\displaystyle {}{\frac {3}{19}}}
?
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