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VTMO 2021 — Grade 3 — titan-cup Question 1

VTMO · VTMO 2021 — Grade 3 — titan-cup

Question 1

Find $B - A$, where $A=1+4+7+10+13+16+19+22+25+28+31$ and $B=2+5+8+11+14+17+20+23+26+29+32$.
  1. $10$
  2. $11$
  3. $12$
  4. $30$
  5. $31$