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Three containers of the same volume contain three different gases. The masses of the molecules are
\( \mathrm{P} \) \( m_{1}, m_{2} \) and \( m_{3} \) and the number of molecules in

VV their respective contciners are \( N_{1}, N_{2} \) and \( N_{3} \). The gas pressure in the containers are \( P_{1}, P_{2} \) and \( P_{3} \) respectively. All the gases are now mixed and put in one of these containers. The pressure \( P \) of the mixture will be
(a) \( P\left(P_{1}+P_{2}+P_{3}\right) \)
(b) \( P=\frac{P_{1}+P_{2}+P_{3}}{3} \)
(c) \( P=P_{1}+P_{2}+P_{3} \)
(d) \( P\left(P_{1}+P_{2}+P_{3}\right) \)
(1991)
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