Answers

2014-05-20T10:44:45+05:30
{2   4   6   8   10   12} - {5   10   15   20   25   30} =    -3   -6   -9   -12   -15   -18
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2014-05-20T10:49:48+05:30
C-D means the elements which are present in C but not in D so the answer will be:
{2,4,6,8,12}

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