某机构为了解云计算的驱动力，对我国一批企业进行了问卷调查（题型为多选题），选择A“优化现有IT效率和效力”的企业占86%，选择B“降低IT成本”的企业占79%，选择C“灾难恢复及保持业务连续性”的企业占80%。据此可推算出，至少有（ ）的企业同时选择了这三项。
- A.45%
- B.54%
- C.66%
- D.79%
正确答案及解析
正确答案
解析
本题考察初等数学基础知识。本题求至少有多少企业选择了这三项，那么要想使得选择三项的企业数最少，则选择两项的企业数最多。即：没有选择A的企业均选择了B和C选项，没有选择B的企业均选择了A和C选项，没有选择C的企业均选择了B和A选项，则最多有（100%-86%）+（100%-79%）+（100%-80%）=55%，则至少有45%的企业同时选择了这三项。
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