Asked by Leonard

How do I use the sigma notation to express the series : 1+5+25+125+625+3125?
Answered by MathMate
First try to make a relation/rule between the different terms:
1=5<sup>0</sup>
5=5<sup>1</sup>
25=5<sup>2</sup>
125=5<sup>3</sup>
625=5<sup>4</sup>
3125=5<sup>5</sup>

So you are really summing
5<sup>0</sup>+5<sup>1</sup>+5<sup>2</sup>+5<sup>3</sup>+5<sup>4</sup>+5<sup>5</sup>

So you would end up with:

i=5
Σ 5<sup>i</sup>
i=0
Answered by Aira
Thank you helps a lot😁