Mathematical probability: when someone hits the target, the probability of hitting the target per shot is 0.9, so what is the probability of just two shots out of four hitting the target? How to calculate? The formula is C4 (2) * 0.9 * 0.9.1* 0.1= 0.0486.

Among them, C4(2) is a combination of four hits and two hits, and there are six kinds of one * * *. The probability of hitting twice is 0.9*0.9, the probability of missing twice is 0. 1*0. 1, and then all the answers are multiplied.

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