Ali has 250 songs on her MP3 player. Of those, 150 are dance songs, 50 are R&B songs, and 30

Question

songs are both dance and R&B.
1) when Ali has her player on shuffle, what are the odds in favour of her hearing a dance song that is not an R&B song?
2) what are the odds against her hearing a song that is both dance and R&B?

Answer 1

First of all, 150 + 50 + 30 ≠ 250

With that:

1) 50/250 = ?

2) 1 - 30/250 = ?