Find Sn of
arithmetico-
sequence
the following
geometric
3, 12, 36, 96, 240
Answers
Comments on the question:
The given sequence is neither an Arithmetic Progression nor a Geometric Progression. So there is no way to find the sum of n terms. However the sum of the given five numbers is (3 + 12 + 36 + 96 + 240) = 387.
Supporting my answer:
Case 1.
The given sequence is
3, 12, 36, 96, 240
Differences between terms
12 - 3 = 9 , 36 - 12 = 24 , ...
Since the differences are not the same, the sequence cannot be an AP.
Case 2.
The given sequence is
3, 12, 36, 96, 240
Ratios of terms are
12 / 3 = 4 , 36 / 12 = 3 , ...
Since the ratios are not the same, the sequence cannot be a GP.
Note: The question is incorrect!
Answer:It is an arithmetico geometric progression
It can be written as 3*1,6*2,9*4,12*8,15*16 where the first terms are in AP and the second terms in GP.
Sum of all terms of an AGP is given as follows:
Step-by-step explanation:
