Question

Which describes the type of sequence...pt.1​

Answer 1

Choice B is correct.

Explanation:

We have given a sequence:

99,89.9,78.8,68.7,............

We have to describe the type of sequence.

First,to check is it a arithmetic:

89.9 - 99 = -9.1

78.8 - 89.9 = -11.1

The common difference is not same so, this cannot be arithmetic sequence.

To check is it a geometric or not.

89.9/99 = 899/990

78.8/89.9=788/8990

The common ratio is not same so, it is not geometric.

Choice B is correct.

Answer 2

neither arithmetic nor geometric

Explanation:

The given sequence is

`99,89.9,78.8,68.7,...`

`89.9-99=-9.1`

`78.8-89.9=-11.1`

The differences are not the same so this cannot be an arithmetic sequence.

`(89.9)/(99)=(899)/(990)`

`(78.8)/(89.9)=(788)/(899)`

The ratios are not the same so it can also not be geometric.

The sequence is neither arithmetic nor geometric.