QUESTION 1

1. Different programming languages demand the use of different syntaxes.

   For each of the following three expressions, indicate what type of expression it is (per discussion in class):

   1. 15 + 8

   2. + 15 8

   3. 15 8 +

QUESTION 2

Suppose you have about three thousand files or directories under your home directory, on Unix or DOS.

What command would you write, at the system prompt, to find all the files or directories that end with "pdf" under your home directory?

QUESTION 3

1. Define P, for generating all the palindromes over the alphabets {0, 1}.