问一道概率题--谢谢大家# WaterWorld - 未名水世界
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MANU AND JANANI ARE PLAYING A COIN TOSS GAME WITH A FAIR PENNY. MANU GETS
A POINT IF THE PENNY LANDS ON HEADS, AND JANANI GETS A POINT IF THE PENNY
LANDS ON TAILS. THE SCORE IS JANANI 9, MANU 7, IN A GAME TO 10 POINTS. WHAT
IS THE PROBABILITY THAT JANANI WILL WIN THE GAME?
A POINT IF THE PENNY LANDS ON HEADS, AND JANANI GETS A POINT IF THE PENNY
LANDS ON TAILS. THE SCORE IS JANANI 9, MANU 7, IN A GAME TO 10 POINTS. WHAT
IS THE PROBABILITY THAT JANANI WILL WIN THE GAME?