Week 2- Geometric Sequences

In Week 1 we had learned about Arithmetic Sequences. This week we had learned about Geometric Sequences. Both of these are different as Arithmetic is addition of a positive or negative number of a common difference and Geometric is multiples of a common ratio. This week we learned how to find a term of a Geometric Sequence.

Geometric Sequence: 2,4,8,16,32

We know that r=2 and = 2.

To find we need to use the equation  = (a)(r)^n-1

So,  = (2)(2)^12-1

= (2)(2)^11

= (2)2048

= 4096

Geometric Sequence: 18, 6, 2, , 

We know r= and = 18

To find we need to use the equation  = (a)(r)^n-1

S0 =(18)()^12-1

=(18)()^11

=(18)()

=()