Here is a list of fractions.
2104208356301050 \frac{2}{10} \quad \frac{4}{20} \quad \frac{8}{35} \quad \frac{6}{30} \quad \frac{10}{50} 1022043583065010One of these fractions is not equivalent to 15\displaystyle \frac{1}{5}51.
Write down this fraction.