Three containes of the same volume contain three different gases. The masses of the molecules are `m_(1), m_(2)` and `m_(3)` and the number of molecules in their respective containers 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 the containers. The pressure `P` of mixture will be
A. `p lt (p_(1) + p_(2) + p_(3))`
B. `p = (p_(1) + p_(2) + p_(3))/(3)`
C. `p = p_(1) + p_(2) + p_(3)`
D. `p gt (p_(1) + p_(2) + p_(3))`
