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+--- Thread: Getting help with questions on the material study.com (/Thread-Getting-help-with-questions-on-the-material-study-com)
Getting help with questions on the material study.com - fork - 05-09-2018
Is there a way to ask questions about the material on study.com? Or is it just do what you can? Once again I've run into something where either I don't understand what is presented or study.com is wrong. Problem in question (if any of you know what the answer to this is, lmk?). I thought this seemed straightforward but study.com has an answer and explanation that doesn't make sense to me. Maybe I should just move on and forget it, but it bothers me.
The numbers 1 through 20 are written on separate slips of paper and placed in a hat. One of the slips is randomly drawn. What is the probability that either a prime number or a number less than 10 is drawn?
RE: Getting help with questions on the material study.com - davewill - 05-09-2018
Should be 9+4(1-9,11,13,17,19) over 20
12/20 = 6/10 = 60%
13/20 = 65%
RE: Getting help with questions on the material study.com - fork - 05-09-2018
THANK YOU. My own simple mistake - counting 15 as a prime when it isn't. (BTW it's 13/20, you forgot 11, which is prime
)
RE: Getting help with questions on the material study.com - davewill - 05-09-2018
(05-09-2018, 09:03 AM)fork Wrote: THANK YOU. My own simple mistake - counting 15 as a prime when it isn't. (BTW it's 13/20, you forgot 11, which is prime
So, I did. I fixed it above so that people don't find the wrong answer.