Lesson 3 of 4 · Form 3 Mathematics
Sequences and series (AP and GP)
18 min
Arithmetic progression (AP)
Constant common difference d: 3, 7, 11, 15...
- nth term: Tₙ = a + (n - 1)d
- Sum: Sₙ = n/2 [2a + (n - 1)d]
Example: Sum of the first 10 terms of 3, 7, 11...: S = 5[6 + 36] = 210.
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