What is the formula for the sum of terms in an arithmetic progression (AP)?
University of Ilorin MTH101 2025A past question
- $S_n = \\frac{n}{2} (2a + (n-1)d)$
- $S_n = \\frac{n(a + l)}{2}$
- $S_n = \\frac{a(1 - r^n)}{1 - r}$
- $S_n = ar^{n-1}$
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