æ¨å¥½ï¼è¿æ¯ä¸ä¸ªæ°å¦é®é¢ï¼è§£çå¦ä¸ï¼
设èçæ¦ç为p
é£ä¹è´çæ¦ç1-p
ä¸å±ä¸¤èçè¯ï¼å¯è½ç´æ¥ä¸¤è
ä¹å¯è½è´ä¸å±
æ¦ç为P=p²+2p²(1-p)
åçï¼5å±3èå¯è½3:0,3:1,3:2
æ¦ç为P=p³+3p³(1-p)+6p³(1-p)²
å
¶ä¸3=C(1,3)ï¼6=C(2,4)ï¼é½æ¯ç»åæ°
温馨提示:答案为网友推荐,仅供参考