April 2019 1 95 Report

Hellp je galère :S une urne contient 3boules vertes et 7 boules rouges , on tire successivement 2 billes avec remise . Si on tire 2 billes vertes on gagne un ipod , si on tire 2 billes rouge on gagne un ours , p(gagne un ipod )=?

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