Answer:
it is geometric
Step-by-step explanation
We have been given with the series
200,40,8,1.6
Arithmetic sequence is the sequence in which difference between consecutive terms is same that is common difference d
d=a_2-a_1
d=40-200=-160 herea_2=40,a_1=200
d=8-40=-32 herea_2=8,a_1=40
We can see the difference is not same
Hence, the given sequence is not arithmetic sequence.
Geometric sequence is the sequence in which ratio of consecutive terms is same that is common ratio r
r=\frac{a_2}{a_1}
r=\frac{40}{200}=\frac{1}{5} herea_2=40,a_1=200
r=\frac{8}{40}=\frac{1}{5} herea_2=8,a_1=40
r=\frac{1.6}{8}=\frac{1}{5} herea_2=1.6,a_1=8
We can see the ratio is same.
Hence, given sequence is geometric
Therefore, Option 1 is correct given sequence is geometric.
