VTMO 2026 - Grade 4 - Semifinal - SET 5 - Self-study Question 17

Question 17

Which calculation below has an even result?

1. $23+24+25+26+27$
2. $20\times7+24\times1+23$
3. $1+3+5+7+\cdots+21$
4. $2024\times7+2025\times3$
5. $1+2+3+4+\cdots+20$