My Arthmetic Sequence

Posted on September 11, 2018 by saejino2016

Determine $t_ {15}$

7, 12, 17, 22, 27. . . . . . . . . . . . . . . . . . . . .

$t_1$ =7 Common difference=5

$t_ {15}$ = 7+(15-1)5

$t_ {15}$ = 7+70

$t_ {15}$ = 77

Determine sum of these first 50 terms

$t_ {50}$ = 7+(50-1)5

$t_ {50}$ = 7+245

$t_ {50}$ = 252

$S_ {50}$ = $\frac{50}{2}$ (7+252)

$S_ {50}$ =25(259)

$S_ {50}$ =6475

In this unit, I could learn new world.

ex) Sequence, series, and Arithmetic

Leave a Reply Cancel reply