Question:If v be the volume and S be the surface area of a cuboid of dimensions a, b, c, then `1/v` is equal to : 

A `s/2 (a + b + c)` 
B `2/s (1/a + 1/b + 1/c)` 
C `(2s)/(a + b + c)` 
D `2s (a + b + c)` 

+ Answer
B 

+ Explanation
`1/v = 1/s xx s/v`

`= (2 (ab + bc + ca))/(s xx abc)`

`= 2/s (1/a + 1/b + 1/c)`

+ Report

Irin Moni

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