There are 3 black and 7 white balls in the box, identical in touch. You draw 3 balls randomly. If you find 1 black ball among the drawn ones, you will win $1, if you find 2 black balls, you win $2 and you will win $10, if all 3 are black. What are the chances to win at least 1 buck?

Question

anonymous · Answer

same as the probability you draw at least one black ball, which is one minus the probability that you draw all white ones (easier to compute that by far)

anonymous · Answer

is it clear how to find the probability you draw all white balls/

anonymous · Answer

mdoublep 

Best Response 
 



Medals 0 3/10 for the first draw.
3/9 for the second.
3/8 for the third.
3/10 + 3/9 + 3/8 = ?

This is what you want to find out.