If I pick a red ball 10 times out of 30 times from a bag that contains red and black balls, then the probability of picking a black ball is _________.

If I pick a red ball 10 times out of 30 times from a bag that contains

1.	If I pick a red ball 10 times out of 30 times from a bag that contains red and black balls, then the probability of picking a black ball is _________.
Answer» If I pick a red ball 10 times out of 30 times from a bag that contains red and black balls, then the probability of picking a black ball is _________.