Mom went shopping at Carrefour, just in time for oranges, bananas, grapes and durians to drop in price, so she decided to choose one of these 4 kinds of fruits to buy home. Dad passed by the bazaar after work and found apples, oranges, Bananas, grapes and pears are for sale, and he decides to choose one to take home. Ask: What is the probability that they bought a different fruit?
妈妈去家乐福购物，正好碰上了橘子、香蕉、葡萄和榴莲大降价，于是她决定从这4种水果中任选一种买回家，爸爸下班时路过集贸市场，发现有苹果、橘子、香蕉、葡萄和梨出售，他也决定任选一种买回家．请问：他们买了不同的水果的概率是多少？
<gadget id="calculator">4 * 5</gadget>
<output>20</output>

<gadget id="calculator">20 - 3</gadget>
<output>17</output>

<gadget id="calculator">17 / 20</gadget>
<output>17/20 = around 0.85</output>

<result>17/20 = around 0.85</result>