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ok got it
i think my solution is also right cos even if we take into account PdV in the line before eqn 1 its value would be so small that the difference in the answer in the end would be of around 0.25K (i calculated it)
in conjurer's soln,
he has made mistake in taking P2 = 81 ,it is actually 76.5 cm
and now his answer would also come to be the same i think
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