(a) (a + b + c)/ 3
(b) 3abc/(ab + bc + ca)
(c) 3abc/(a + b + c)
(d) 3(ab + bc + ca)/(a + b + c)
Answer: b
(a) (a + b + c)/ 3
(b) 3abc/(ab + bc + ca)
(c) 3abc/(a + b + c)
(d) 3(ab + bc + ca)/(a + b + c)
Answer: b
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