VTMO 2026 - Grade 4 - Semifinal - SET 3 - Self-study Question 11

Question 11

Which of the following expressions has an even value?

1. $1\times3\times5\times\cdots\times99$
2. $2013\times2014+2015$
3. $1\times2\times3\times\cdots\times100+101$
4. $2\times4\times6\times\cdots\times100+101$
5. $1+3+5+\cdots+99$