Understand the topic first. Party A and Party B each shot 1 time, and the target was hit by Party A, which means that at least 1 people were hit, including Party A, so there are 1 situations:

1, A hits, regardless of whether B hits or not, all conditions are met, so the probability is 1/2.

Then the target hit probability = 1- none hit =1-1/2x3/10 =17/20.

So the target is hit, and the probability is a =1/2 ÷17/20 =10/17.

An important prerequisite for seeing things clearly