（13分）（2011?重庆）某市公租房的房源位于A、B、C三个片区，设每位申请人只申请其中一个片区的房源，且
\u67d0\u5e02\u516c\u79df\u623f\u7684\u623f\u6e90\u4f4d\u4e8eA\u3001B\u3001C\u4e09\u4e2a\u7247\u533a.\u8bbe\u6bcf\u4f4d\u7533\u8bf7\u4eba\u53ea\u7533\u8bf7\u5176\u4e2d\u4e00\u4e2a\u7247\u533a\u7684\u623f\u6e90\uff0c\u4e14\u7533\u8bf7\u5176\u4e2d\u4efb\u4e00\u4e2a\u7247\u533a\u7684\u623f\u89e3\uff1a(\u2160)\u8bbe\u4e8b\u4ef6A\u8868\u793a\u201c\u6ca1\u6709\u4eba\u7533\u8bf7A\u7247\u533a\u623f\u6e90\u201d\uff0c\u6240\u6709\u53ef\u80fd\u7684\u7533\u8bf7\u65b9\u5f0f\u6709 \u79cd\uff0c\u5176\u4e2d\u6ca1\u6709\u4eba\u7533\u8bf7A\u7247\u533a\u623f\u6e90\u65b9\u5f0f\u6709 \u79cd\uff0c\u5219\u6ca1\u6709\u4eba\u7533\u8bf7A\u7247\u533a\u623f\u6e90\u7684\u6982\u7387\u4e3a \u3002 (\u2161)\u8bb0\u201c\u6bcf\u4e2a\u7247\u533a\u7684\u623f\u6e90\u90fd\u6709\u4eba\u7533\u8bf7\u201d\u4e3a\u4e8b\u4ef6B\uff0c\u6240\u6709\u53ef\u80fd\u7684\u7533\u8bf7\u65b9\u5f0f\u67093 4 \u79cd\uff0c\u5176\u4e2d\u6bcf\u4e2a\u7247\u533a\u7684\u623f\u6e90\u90fd\u6709\u4eba\u7533\u8bf7\u7684\u65b9\u5f0f\u6709 \u79cd\uff0c\u2234\u6bcf\u4e2a\u7247\u533a\u7684\u623f\u6e90\u90fd\u6709\u4eba\u7533\u8bf7\u7684\u6982\u7387\u4e3a \u3002
2\uff093\u4e2a\u533a\u57df\u9009\u4e24\u4e2aC(3,2)
\u4e24\u4e2a\u533a\u57df\u5185\u6709\u4e24\u79cd\u5206\u6cd5\uff0c1+3\u62162+2
1+3\uff1a\u5148\u9009\u5176\u4e2d1\u4e2a\u533a\u57df\uff0c\u8fd9\u4e2a\u533a\u57df\u6709\u4e00\u4f4d\u7533\u8bf7\u8005C(2,1)\uff1b\u518d\u9009\u662f\u54ea\u4e00\u4e2a\u7533\u8bf7\u8005C(4,1)\uff08\u6216\u90093\u4e2a\u7533\u8bf7\u8005=C(4,3)\uff09
2+2\uff1a\u90fd\u662f2\u4eba\uff0c\u6ca1\u6709\u987a\u5e8f\uff0c\u76f4\u63a54\u4eba\u79cd\u90092\u4eba\u7533\u8bf7\u5176\u4e2d\u4e00\u4e2a\u533aC(4,2)\uff1b\u5269\u4f59\u4e24\u4eba\u6ca1\u6709\u9009\u62e9C(2,2)
3*(2*4+6)=42
3\uff094\u4eba3\u533a\u57df\u53ea\u67091\u79cd\u65b9\u6cd5\uff0c2+1+1
\u5148\u9009\u51fa\u4e00\u4e2a\u533a\u4f4f2\u4eba\uff0cC(1,3)\uff1b\u9009\u51fa\u8fd9\u4e24\u4e2a\u4ebaC(4,2)
\u5269\u4f592\u4eba\u4f4f2\u533a\uff0c\u67092\u79cd\u65b9\u6cd5
3*6*2=36
（Ⅰ） （Ⅱ）ξ的分布列是：
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