1.2,3,7.5,18.75, which formula can be used to describe the sequence

Step-by-step explanation:

If we observe the given sequence, we find that the ratio of two consecutive terms is the same. i.e.

Such a sequence in which the ratio of consecutive terms remain the same is know as Geometric Sequence. Following formula is used to represent a Geometric Sequence:

Here:

is the general term. Using the value of n =1,2,3 ... will give us the term of the sequence.

is the first term which is 1.2 in this case.

r represents the common ratio which is 2.5.

Using these values we get:

This formula can be used to represent the given sequence.

astronomers is your final answer! : )