1. The problem statement, all variables and given/known data A four digit number can be represented by 'abba'. (where a and b are digits) 1) show that abba is always divisible by 11. 2) show that abbbba is always divisible by 11. 3) is abbba divisble by 11? 2. Relevant equations non 3. The attempt at a solution i honestly have no idea how to begin solving this, i understand what its asking but have no idea how to prove it.