The final score of a football match between Team A and Team B is 4:2. It is known that Team A is ahead by one goal, and Team B has never been ahead during the game, so what is the order of the two teams scoring goals? different possibilities.
甲队和乙队进行的一场足球赛的最终比分是4：2，已知甲队先进一球，而且乙队在比赛过程中始终都没有领先过，那么那么两队的入球次序有多少种不同的可能．
<gadget id="calculator">10 - 1</gadget>
<output>9</output>

<result>9</result>