Question

In the 3 x 4 dot rectangle shown, there are 10 dots on the outside and 2 dots on the inside. In a 4 x 5 dot rectangle, there are 14 dots on the outside and 6 dots inside. In a 1989 x 1990 dots on the dot rectangle there are outside.

Answer 1

In a 1989 x 1990 dot rectangle, there are 39878 dots on the outside and 39800 dots inside.