50%
The probability is 11/21.
The probability of picking 5+3 = 8 students is 0.1202
It is 21/26.
It is 21/26.
P(7)= 1/30
None. I do not have a brother so the event cannot occur.
The probability of picking a distinct set of 3 numbers from 20 is1/[20!/(3!)(17!)]= 1/1140The probability of only picking 3 from 20 is1/20
The probability is 11/21.
The probability is 1/b.
The probability is 0.25
The answer depends on whether the first number is replaced before picking the second. If not, the probability is 0.029
The probability of picking a black ace in one random draw from a normal pack of playing cards is 1/26.
There are 4 Kings in a deck of 52 cards, so the probability of picking a King is 4/52 or 1/13.
The probability of picking 5+3 = 8 students is 0.1202
1/13
It is 21/26.
It is 21/26.