Use sigma notation to write the sum. 1. 1 / 3(1) + 1 / 3(2) + 1

Question:

Use sigma notation to write the sum.
1. 1 / 3(1) + 1 / 3(2) + 1 / 3(3) + . . . . + 1 / 3(9)
2. 5 / 1 + 1 + 5 / 1 + 2 + 5 / 1 + 3 + . . . + 5 / 1 + 15
3. [2(1/8) + 3] + [2(2/8) + 3] + . . . . + [2(8/8) + 3]
4. [1 - (1/6)2] + [1 - (2/6)2] + . . . . + [1 - (6/6)2]