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The ratio of number of atoms present in ...

The ratio of number of atoms present in a simple cubic, body centered cubic and face centered cubic structure are x: y : z. The numerical value of sum of x, y and z is _______ .

A

`2.4 N_A`

B

`4 N_A`

C

`1.2 N_A`

D

`2 N_A`

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