Calculators · Algebra
Arithmetic progression
The nth term, the sum of n terms, which term a number is, or the common difference.
Term 20 is 98
The working
- The terms go 3, 8, 13, …, adding 5 each time.
- aₙ = a + (n − 1)d = 3 + (20 − 1) × 5 = 3 + 95 = 98.