Posted by billy on Saturday, February 2, 2013 at 4:58pm.
find n(A)for each set
A={1/2, 1/2, 1/3, 1/3,..., 1/10, 1/10}

math  eh?  Steve, Saturday, February 2, 2013 at 5:11pm
what is n(a set)?

math  Reiny, Saturday, February 2, 2013 at 5:15pm
looks like the fractions from 1/2 , 1/3 . ... 1/10 come in pairs with their negatives,
I count 18 of them

math  billy, Saturday, February 2, 2013 at 5:18pm
n(A) is the cardinal of the sets and how did you get the #18

math  billy, Saturday, February 2, 2013 at 5:21pm
o ok i got it 1/2 1/3 1/4 1/5 1/6 1/7 1/8 1/9 1/10 thanks
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