The Sum/Product of the First N Counting Numbers
If N = 4, the sum we want is 1 + 2 + 3 + 4 = 10.
If N = 4, the product we want is 1 * 2 * 3 * 4 = 24.
The product of the first N counting numbers is written 'N!'.
| N | Sum From 1 to N | Product From 1 to N |
|---|---|---|
| 2 | 3 | 2 |
| 3 | 6 | 6 |
| 4 | 10 | 24 |
| 5 | 15 | 120 |
| 6 | 21 | 720 |
| 7 | 28 | 5,040 |