Buratino, Fox Alice and Kot Basilio found a treasure with 10 gold coins. The fox Alice took away 5 coins, Kot Basilio 3 coins, Buratino 2 coins. It is known that two coins false. To find the probability that at least Buratino got one of them. Otvet to round with an accuracy up to 0.01.

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Let's designate A– "By Buratino two coins and at least one false got". n=C210=10! / (10–2)! · 2! =10·9/2=45 ways to choose two coins. m=C81 · C12+C22=8·2+1=17 ways to choose though one false (one or both) r (A) =m/n=17/45=0.37777... p=0.38
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