Question

a spinner has regions numbered through 1-21 what is the probability that the spinner will stop on an even number or a multiple of 3

a spinner has regions numbered through 1-21

what is the probability that the spinner will stop on an even number or a multiple of 3..

I am confused.
I keep coming up with 17/21

but the real answer is 2/3

how how how ?

Even number = 10/21

Multiple of 3 = 7/21

10/21 + 7/21 = 17/21

Guess what? I keep coming up with 17/21 too.

Book typo?

you must subtract 3/21= 14/21. then simplify, which gives you 2/3.

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