Question

What type of sequence is 1,215,405,135,45...?
I need an explanation to this question. ​

Answer 1

Let's divide terms

`\\ \sf\longmapsto r=(405)/(1215)=(1)/(3)`

`\\ \sf\longmapsto r=(135)/(405)=(1)/(3)`

`\\ \sf\longmapsto r=(45)/(135)=(1)/(3)`

It's a decreasing Geometric sequence

Answer 2

Decreasing Geometric Sequence

Explanation:

A geometric sequence is a sequence of non-zero numbers where each term after the first is found by multiplying the previous one by a fixed value. Here, we can multiply by 1/3 each time to get the next number, and out sequence is decreasing, so we have a DGS