There are two bags containing several colored balls. The bag B1 contains 17 red balls, 17 blue balls, and 17 green balls. The bag B2 contains 18 red balls, 12 blue balls and 14 green balls. A student of your class wanted to draw 2 red balls and 2 blue balls. 1. If he has the option to draw from only bag B1 , what is the probability of drawing the four balls? 2. If he can choose any bag in an equiprobable manner, what is the probability of drawing the four balls in this case?

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