Posted by HM on Wednesday, November 2, 2011 at 1:25pm.
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?
A= 16/21
You need to remember that 6 is also an even number, so you can't count it twice as it is only one number. So you have 10 possible even numbers, plus 7 possible numbers that are multiples of 3, minus 1 multiple of 3 (the number 6) because you already counted it in your even numbers.
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