In limited versions of BASIC, identifiers can be 1 or 2 characters long, but the first must be a letter and the second a letter or digit.
I thought that there are 26 possibilities for the first position and 36 for the second (26 + 10 for the digits), which would give 26*36 = 936 possible identifiers. The book however says the answer 962, so I'm not sure what I'm doing wrong.