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(A) White tin is an example of tetragona...

(A) White tin is an example of tetragonal system.
(R) For tetragonal system a=b=c and `alpha=beta=gamma ne 90^(@)`.

A

A and R true and R is the correct explanation of A

B

A and R are true and R is not the correct explanation A

C

A is true but R is not true

D

A is not true but R is true

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