Others Maths Puzzle

Solve it if you can:

If a+b+c=0,then find the value for
(a+b/c+b+c/a+c+a/b) (a/b+c+b/c+a+c/a+b)

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Others Other Question

Next three numbers in the series:
4,6,12,18,30,42,60,72,102,108,.
Price of 8 pens and 10 books RS.3138
What price of 12 pens and 15 books?????