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Which of the following expressions is correct in case of a CsCl unit cell (edge length 'a')?

1. 2 a r r Cl CS = + − +
2. a 2 3 r r Cl CS = + − +
3. 2 a r r Cl CS = + − +
4. a r r Cl CS = + − +

Correct answer: a 2 3 r r Cl CS = + − +

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