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Three cubes of metal , whose edges are 3...

Three cubes of metal , whose edges are 3cm, 4cm and 5 cm respectively are melted to form a new cube. What is the surface area of the new cube ?

A

`216 cm^2`

B

`56 cm^2`

C

`36 cm^2`

D

none of these

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The correct Answer is:
A
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