http://img685.imageshack.us/img685/3025/39242128.png

So far i have this

VEC = input('Please type a value that is > 9 and < 21:')

if VEC < 10 || VEC > 21

error('Incorrect Input... Quitting!')

Vec1 = input('Type in a value for the first element:')

But not sure if I'm on the right track.. Could someone help me with this problem