设A、B为两个事件，且<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251114/23827440_0.png">，<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251114/23827440_0_1.png">，<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251114/23827440_0_2.png">，则<img border="0" alt="" src="https://tuku.weimei168.com/uploads/upimg/20251114/23827440_0_3.png">等于（　　）。