A 4 digit code number is generated by randomly selecting digits, with replacement, from the set {1,2,3,...,9}....
A 4 digit code number is generated by randomly selecting
digits, with replacement, from the set {1,2,3,...,9}.
Find the probability that the number consists of two 9's and two
6's.Give an exact answer as a fraction of the form
a/b (explained).
Homework Answers
total number of possible 4 digit code with replacement from 9 digits =94 =6561
number of ways 4 digit code can be made with two 9's and two 6's =4!/(2!*2!) =6
therefore probability that the number consists of two 9's and two 6's =6/6561 =2/2187
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