Question

Find Sn of the following arithmetico -

geometric sequences3, 12, 36, 96, 240, …​

Answer 1

Answer

r1 ≠ r2, hence the sequence is not geometric.

Explanation:

The sequence given is 3, 12, 36

In a geometric sequence, a constant common ratio r is maintained all through out the sequence.

The common ratio, r is obtained by dividing a term by its preceding term

• Finding r -

1) r1 = 12/ 3 = 4

2) r2 = 36 / 12 = 3

Since r1 ≠ r2 the sequence is not geometric.

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