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If x, y, z are in A.P. and tan –1 x, tan –1 y and tan –1 z are also in A.P., then -

1. 6x = 3y = 2z
2. 6x = 4y = 3z
3. x = y = z
4. 2x = 3y = 6z

Correct answer: x = y = z

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