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答案：
A
已知50个人
40%被安排到A，剩下的60%被安排到B。但实际上，70%想去A，30%想去B，问最少有多少被安排到他们不想去的组？
最少，安排到的B的都是想去B的，想去A的有40%安排到A组，其余的安排到B组，也就是30%的人被安排到他们不想去的组，即50*30%=15 选A 
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