Week 1 – Arithmetic Sequence

4, 9, 14, 29, 34…

$t_{50}$ =?

$t_{50}$ = $t_1$ + (n – 1) (d)

$t_{50}$ = 4 + 49 (5)

$t_{50}$ = 4 + 245

$t_{50}$ = 249

$S_{50}$ = $\frac{n}{2}$ ( $t_1$ + $t_n$ )

$S_{50}$ = $\frac{50}{2}$ (4 + 249)

$S_{50}$ = 25 (253)

$S_{50}$ = 6325

Macy's Blog