self Maths Puzzle

3 people to be seated on 9 seats such that none of them are adjacent

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self Other Question
21. A can hit the target 4 times in five shots. B can hit three times in 4 shots, C can hit the target twice in three shots. They fire a volley i.e., shot simultaneously. What is the probability that exactly 2 shots hot the target? 8,9,20,63.....
a)74
b)83
c)124
d)256