Edges of a cuboid are a, b, c its volume is v cubic units and its total surface is S sq. units. Then 1/V=?

(a) 1/2 S(a+b+c)
(b) 2/S (1/a+1/b+1/c)
(c) 2S/ (a+b+c)
(d) 2S (a+b+c)

Anurag Mishra Professor Asked on 3rd February 2016 in Maths.
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    Answer:  (b) 2/S (1/a + 1/b + 1/c) 

    Anurag Mishra Professor Answered on 6th February 2016.
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