A box contains only blue buttons, green buttons and yellow buttons. A button is taken at random from the box. The table shows the probability of taking a blue button and a green button.
| Colour | Blue | Green | Yellow |
|---|---|---|---|
| Probability | 14\displaystyle \frac{1}{4}41 | 58\displaystyle \frac{5}{8}85 |
Complete the table to show the probability of the button being yellow.
