6 A box contains 4 pears and 7 oranges. Three fruits are taken out at random and eaten. Find the probability that
- 2 pears and 1 orange are eaten, in any order,
- the third fruit eaten is an orange,
- the first fruit eaten was a pear, given that the third fruit eaten is an orange.
There are 121 similar boxes in a warehouse. One fruit is taken at random from each box.
- Using a suitable approximation, find the probability that fewer than 39 are pears.