SOLUTION: A) A college wants to create an easily accessible 7-digit telephone to be used for registration purpose. The first 3 digits must be 777 while remaining four cannot be 0 or 1 and no

Algebra ->  Probability-and-statistics -> SOLUTION: A) A college wants to create an easily accessible 7-digit telephone to be used for registration purpose. The first 3 digits must be 777 while remaining four cannot be 0 or 1 and no      Log On


   

Question 935105: A) A college wants to create an easily accessible 7-digit telephone to be used for registration purpose. The first 3 digits must be 777 while remaining four cannot be 0 or 1 and no repetition are allowed. Find all possibilities. B) repeat A with repetitions allowed.
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
A) A college wants to create an easily accessible 7-digit telephone to be used for registration purpose.
Pattern:: 777????
-----------------------
The first 3 digits must be 777 while remaining four cannot be 0 or 1 and no repetition are allowed. Find all possibilities.
Ans:: 1*1*1*8*7*6*5 = 1680
------------
B) repeat A with repetitions allowed.
Ans:: 1*1*1*8*8*8*8 - 4096
-----------------
Cheers,
Stan H.