A person shoots 8 shots, hits 4 shots, and what is the number of situations in which exactly 3 shots are connected together in the 4 shots.
某人射击8枪，命中4枪，命中4枪中恰好有3枪连在一起的情况的种数是多少．
<gadget id="calculator">5 * 4</gadget>
<output>20</output>

<result>20</result>