Question

What conjecture can you make about the sum of the first 20 positive even numbers?

2
=
2
=
2 + 4
=
6
=
2 + 4 + 6
=
12
=

2 + 4 + 6 + 8
=
20
=

2 + 4 + 6 + 8 + 10
=
30
=