王萍和李冬进行答题比赛,工10题,每答对一道得20分,打错一道扣12分,王平最后得了104分.问:王萍答对了几

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学校新蕾广播台要在3名男生和4名女生中,挑选男、女主持人各一名,共有______种不同的选法;王萍是女生中的一个,被选中的可能性是
()
()
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3×4=12(种)
1÷4=[1/4]
故答案为:12、[1/4].

点评:
本题考点: 简单事件发生的可能性求解.

考点点评: 此题主要考查了乘法原理的运用以及求可能性的方法:求一个数是另一个数的几分之几,用除法列式解答.