What is 6 mod 9 + 11 mod 9 congruent to?
a) 8 mod 9
b) 6 mod 9
c) 7 mod 9
d) 0 mod 9
6mod 9+11mod 9≡17mod 9=8mod 96 mod\ 9 + 11 mod\ 9\equiv17mod\ 9=8mod\ 96mod 9+11mod 9≡17mod 9=8mod 9
Answer: a) 8 mod 9
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