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यदि $\mathrm{A}$ और $\mathrm{B}$ दो घटनाएँ इस तरह से हों कि $\mathrm{P}(\mathrm{A})=\frac{1}{3}, \mathrm{P}(\mathrm{B})$ $=\frac{1}{4}, \mathrm{P}(\mathrm{A} \cap \mathrm{B})=\frac{1}{5}$