- #1

22990atinesh

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## Homework Statement

A code consists of at-most two identical letters followed by at-most four identical digits. The code must have atleast one letter and one digit. How many distinct codes can be generated using letters A-Z and digits 1-9.

## Homework Equations

## The Attempt at a Solution

//One letter followed by one or more digits

##26 \times 10 + 26 \times 10 \times 10 + 26 \times 10 \times 10 \times 10 + 26 \times 10 \times 10 \times 10 \times 10 + ##

//two letters followed by one or more digits

##26 \times 26 \times 10 + 26 \times 26 \times 10 \times 10 + 26 \times 26 \times 10 \times 10 \times 10 + 26 \times 26 \times 10 \times 10 \times 10 \times 10##

But the ans is too big it doesn't matches with the result. What can be correct answer