SOLUTION: Suppose you randomly choose a number between 1 and 20.What are the odds in favor of choosing a prime number?

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Question 264049: Suppose you randomly choose a number between 1 and 20.What are the odds in favor of choosing a prime number?
Found 2 solutions by jim_thompson5910, drk:
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
Hint: P(prime number) = Number of primes from 1 to 20/Number of numbers from 1 to 20

Answer by drk(1908) About Me  (Show Source):
You can put this solution on YOUR website!
we have three things to consider: success, failure, total
we can create a chart for these as
S . . . . F . . . . T
8 . . . . 12 . . . 20
odds in favor are success / failure so we get
8/12 = 2/3