Prove by contradiction: A positive integer is divisible by 10 if and only if its last
Chapter 20, Problem 20.12(choose chapter or problem)
Prove by contradiction: A positive integer is divisible by 10 if and only if its last (ones) digit (when written in base ten) is a zero. You may assume that every positive integer N can be expressed as follows: N D dk10k C dk110k1 C C d110 C d0 where the numbers d0 through dk are in the set f0; 1; : : : ; 9g and dk 6D 0. In this notation, d0 is the ones digit of Ns base ten representation
Unfortunately, we don't have that question answered yet. But you can get it answered in just 5 hours by Logging in or Becoming a subscriber.
Becoming a subscriber
Or look for another answer