Summary (Grade 12 NSC Matric Mathematics): Flashcards

Sequence with constant difference between consecutive terms

$T_n = a + (n - 1)d$

Sequence where second differences are constant

$T_n = an^2 + bn + c$

Sequence with constant ratio between consecutive terms

$T_n = ar^{n-1}$

$S_n = \frac{n}{2}[a + l]$

$S_n = \frac{a(1 - r^n)}{1 - r}$

$S_\infty = \frac{a}{1 - r}$

$-1 < r < 1$