Use your knowledge of central and inscribed angles to find m

its much difficult

Step-by-step explanation:

Proving that an inscribed angle is half of a central angle that subtends the same arc.

2600.

Step-by-step explanation:

There are 26 letters.

Also there are 10P2 permutations of the digits 0-9

10P2 =  10!/(10-2)! = 90.

There are 10 repeated digits.

So the number of possible codes are 26*(90 + 10)

= 2600.