A student is asked to make up a 6 digit number by arranging the digits 111223. What is the probability that he will pick a number that has the 2's separated?
Total number of arrangements = 6!/(3!2!)
= 60
No of ways where the 2's are together
= 5!/3!
= 20
so the number of ways the 2's are apart
= 40
so the Prob(the 2's are separated) = 40/60
= 2/3
Thanks. =)
find the following sets
A'
B'
AuB'
(AuB)'
describe the following sets in words:
B u C
A u B
A n C
A u(B n C)
a coin is tossed 8 times. caluclate the problitlty of tossing
6 heads and 2 tails
7 heads and 1 tails
and at least 6 heads