### Rational Expressions

1 For the rational expression S = ( an+1 - 1 ) / ( a - 1), the value of S for a = 2 and n = 5 is: A) 31 B) 127 C) 63 D) 15 E) None of the above. 2 For the rational expression in question 1 above, the value of S for a = 1 and n = 2 is: A) 1 B) 2 C) 3 D) undefined, since the denominator of S is zero fo