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VTMO 2014 — Grade 8 — semifinal Question 8

VTMO · VTMO 2014 — Grade 8 — semifinal

Question 8

Natural $a , b$ leave remainders $1 , 2$ modulo $8$. Find the remainder of a $^{2} - b^{2}$ modulo $8$.
  1. $1$
  2. $3$
  3. $5$
  4. $6$
  5. $7$