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The wavelengths of \( K_{\alpha} \) X-rays of two metals ' \( A \) ' and ' \( B \) ' are \( \frac{4}{1875 R} \) and \( \frac{1}{675 R} \) respectively, where ' \( R \) ' is rydberg constant. The number of elements lying between ' \( A \) ' and ' \( B \) ' according to their atomic numbers is
(A) 3
(B) 6
(C) 5
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