Two pendulums \( X \) and \( Y \) of time periods \( 4 \mathrm{~s} \) and \( 4.2 \mathrm{~s} \) ...

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Two pendulums \( X \) and \( Y \) of time periods \( 4 \mathrm{~s} \) and \( 4.2 \mathrm{~s} \) are made to vibrate simultaneously. They are initially in same phase. After how many vibrations of \( X \), they will be in the same phase again?
(a) 30
(b) 25
(c) 21
(d) 26
\( \mathrm{P} \)
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