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# Two soap bubbles combine to form a single bubble. In this process, the change in volume and surface area are respectively V and A. If P is the atmospheric pressure, and T is the surface tension of the soap solution, the following relation is true.

$\begin {array} {1 1} (a)\;4PV+3TA=0 & \quad (b)\;3PV-4TA=0 \\ (c)\;4PV-3TA=0 & \quad (d)\;3PV+4TA=0 \end {array}$

(d) 3PV+4TA=0