# Suppose a book-shelf has 6 mathematics texts, 3 physics texts, 4 chemistry texts, and 5 computer science texts. Find the number n of ways a student can choose: a) one of the texts. b) one of each type of text.

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a. one of the texts;

`n = 5+3+6+4 = 18 ways`

b. one of each type of text.

```n = 5*3*6*4 = 360 ways
```

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