math
posted by m on .
How many different license plates could be made if they have one or two letters followed by 1,2,or 3 digits? Reptetitions are allowed.
I figured that 26 would be for 1 letter and 52 for 2 letters
so (26+52) but not sure how to figure the numbers part.

26*10+26*10^2+26*10^3+
26^2*10+26^2*100 + 26^2*1000
check that.