two problems, how do I write them in sigma notation?
1. Write 1 + 4 + 9 + 16 + 25 + 36 in sigma notation.
2. Write 3 + (2) + (1) + 0 + 1 in sigma notation.
1. Write 1 + 4 + 9 + 16 + 25 + 36 in sigma notation.
2. Write 3 + (2) + (1) + 0 + 1 in sigma notation.

1. (summation from i = 1 to 6) i^2
2. (summation from i = 3 to 1) i
2. (summation from i = 3 to 1) i