# Building the perfect number 28 with fractions - part2

Here is a follow up of Building the perfect number 28 with fractions

You are given the fractions $$\frac{3}{2}, \frac{5}{2}, \frac{7}{2}, \frac{11}{2}.$$

Use any operation of $$+, -, *, /, ()$$ to build 28 with those four fractions. You must use all four fractions exactly once.

• Funnily, with this one, it seems quite easy to achieve with just three of the fractions but seems very difficult with four. Jan 15, 2020 at 11:57

$$\displaystyle\binom{\frac{11}{2} + \frac{5}{2}}{\frac{7}{2} - \frac{3}{2}} = \binom{8}{2} = 28$$