My work: L=letter, D=digit

2 2 9 9 9 9 9 9 9 9 9

___ ___ ___ ___ ___ ___ ___ ___ ___ ___ ___

L L D D D D D D D D D

So there are 2 possible answers for the first blank, 2 possible answers for the second blank, 9 for the third, 9 for the forth, 9 for the fifth, and so on.

2*2*9*9*9*9*9*9*9*9*9

2^2*9^9=

1,549,681,956

There are 1,549,681,956 different code possibilities if repetition is permitted. Is this correct?