Two pendulums of time periods \( 3 \mathrm{~s} \) and \( 7 \mathrm{...

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Two pendulums of time periods \( 3 \mathrm{~s} \) and \( 7 \mathrm{~s} \) respectively start oscillating simultaneously from
\( \mathrm{P} \) two opposite extreme positions. After how much

W time they will be in phase
(1) \( \frac{21}{8} s \).
(2) \( \frac{21}{4} \mathrm{~s} \)
(3) \( \frac{21}{2} s \)
(4) \( \frac{21}{10} \mathrm{~s} \)
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