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The CD player is on random selection a CD has 20 songs 7 of witch are ky's favorites what is probability that the first song played is one of the favorites?
It's fractions. You are asking what chance a song is going to be played out of 20 when there are 7 that you'd like to be played. So 7 out of 20 will be a favourite. The way mathematicians show 7 out of 20 is 7/20 (7 divided by 20 or 7 twentieths). So the probability is 7 to 20.
Most mathematical problems will need you to divide down to the lowest common denominators, but 7:20 doesn't have one.
If it were 7 out of 21 then it could be reduced to 1 in 3 (divide by 7)
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