Khan/khan-exercises — pull request #54316 by mauk81 (2013-07-17 00:58:48+00:00)
Title: remove some dots after number in hints

it may be confusing like
```
This is 30%⋅30%, or 0.30⋅0.30=0.090.
```
or
```
So, the probability that both the Captain and the pirate miss is 5/9⋅5/8=25/72.
```