If in \( \triangle A B C \), sides \( a, b, c \) are in A.P. then \...

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If in \( \triangle A B C \), sides \( a, b, c \) are in A.P. then
\( \mathrm{P} \)
(1) \( B60^{\circ} \)
(2) \( B60^{\circ} \)
(3) \( B \leq 60^{\circ} \)
(4) \( B=|A-C| \)
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