sequences – Jeremy's Blog

Week 1 – My Arithmetic Sequence

jeremyz2015 on February 4, 2018

My Arithmetic Sequence:

21,23,25,27,29

The Sequence has a common difference of +2

Part one:

Tn=T1+(n-1)D

T50=21+(50-1)2

T50=21+49×2

T50=21+98

T50=119

Part two:

Sn=(T1+Tn) $\frac{n}{2}$

S50=(21+119) $\frac{50}{2}$

S50=140 $\frac{50}{2}$

S50=140×25

S50=3500