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N similar slabs of cubical shape of edge...

N similar slabs of cubical shape of edge b are lying on ground. Density of material of slab is p. Work done ot arrange them one over the other is -

A

`(N^(2)-1)b^(3)pg`

B

`(N-1)b^(4)pg`

C

`1//2(N^(2)-N)b^(4)pg`

D

`(N^(2)-N)b^(4)pg`

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The correct Answer is:
C
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