A license plate in a state has three letters A-Z and 4 digits 0-9 except the first digit cannot be 0. If the letters and digits can be repeated how many different license plate combinations are possible?

The sum of the first eight terms of an arithmetic progression is 9m + 14. the fifth term of the06 progression is 2m - 6, where m is a constant.given that the first term of the progression is 26,find the value of the common difference, d and thevalue of m.