Homework Help: Math

Posted by Carrie on Sunday, March 7, 2010 at 12:59am.

A spinner has regions numbered 1 through 21. What is the probability that the spinner will stop on an even number or a multiple of 3?

Okay so I am lost. I understand that the probability of an event is

the # of ways an event can occur over the total # of possible outcomes.

I need some explaining done. Please

Math - Carrie, Sunday, March 7, 2010 at 1:02am
Would the total possible outcomes be 17?

The number of evens would be 10 and the multiply of 3 is 7. So 10 and 7 together is 10.
Math - Reiny, Sunday, March 7, 2010 at 7:43am
List the numbers from 1 to 21 which are either even or multiples of 3:
2,3,4,6,8,9,10,12,14,15,16,18,20,12

I count 14, not 17.
Prob(event as stated) = 14/21 = 2/3
Math - Carrie, Sunday, March 7, 2010 at 8:50am
Ok. I counted some numbers twice. I needed to write the numbers out like you did. Thanks

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