题干

甲乙两俱乐部举行乒乓球团体对抗赛.双方约定:
①比赛采取五场三胜制(先赢三场的队伍获得胜利.比赛结束)
②双方各派出三名队员.前三场每位队员各比赛﹣场
已知甲俱乐部派出队员A1、A2.A3,其中A3只参加第三场比赛.另外两名队员A1、A2比赛场次未定:乙俱乐部派出队员B1、B2.B3,其中B1参加第一场与第五场比赛.B2参加第二场与第四场比赛.B3只参加第三场比赛
根据以往的比赛情况.甲俱乐部三名队员对阵乙俱乐部三名队员获胜的概率如表:
 A1
 A2
 A3
 B1
5
6
3
4
1
3
 B2
2
3
2
3
1
2
 B3
6
7
5
6
2
3
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The Sands of Time

    St Cyrus National Nature Reserve is much more than just golden sands and beautiful flowers. The area has a long human history too. From Stone Age hunters to amazing pioneers, discover the daring deeds and sad stories from St Cyrus' past.

Date: 23rd August 2010

Time. 2 p. m.—3:45 p. m.

Type of event. Guided walk

Between the Tides

    A celebration of the world between the tides. Join local salmon (大马哈鱼) fisherman Jim Ritchie on a fascinating walk to learn how local folk have made a living from the world between the tides, harvesting salmon from the beach at St Cyrus for hundreds of years.

Date: 25th August 2010

Time: 2 p. m.—4 p.m.

Type of event: Family event

Ice & Fire

    St Cyrus National Nature Reserve has had an eventful life! From its days near the equator (赤道) to volcanic eruptions and ice ages. Celebrate the start of Scottish Geology Month with a walk through the reserve and travel back in time to uncover the clues to St Cyrus' past hidden in the cliffs.

Date: 31st August 2010

Time: 2 p. m.—3:45 p. m.

Type of event: Guided walk

Scary Stories

    It's getting darker at nights... it's almost Halloween, when the ghosts (鬼怪) come out to play. Join us for some spooky stories of Dinnet and Deeside long ago... and listen out for things that sound strange in the night!

Date: 25th October 2010

Time: 7 p. m.—9 p. m.

Type of event: Family event

Note:

* All under 18's must be accompanied by an adult

* Pets allowed: No

* Cost: Free

* Phone: 01674­830736

* Location: SNH Visitor Centre, St Cyrus National Nature Reserve