In a certain region all license plates are composed of three letters followed by three numbers, or four letters followed by two numbers. Find how many license plates are possible.
Note : We have 26 possible letters and 0-9 = 10 possible numbers
The number of posssible plates =
(26)^3 (10)^3 + (26)^4 ( 10)^2 = 63,273,600
