Find the sum of the first five terms of the geometric series 1+3+9+
a. 40
b. 121
c. 364
d. 1093

Good evening ,

B. 121

Step-by-step explanation:

1×3=3

3×3=9

9×3=27

27×3=81

the sum = 1+3+9+27+81 = 121.

:)

The sum of five terms of the series is 121.

Option - B

SOLUTION:

Given that, we have to find the sum of the first five terms of the geometric series 1 + 3 + 9 + ...  

We already know, first three terms, let us find next two terms also.

Now, we know that, term is term multiplied by the common ratio so,

And, term is term multiplied by common ratio. So,

Now, sum of first five terms =

Hence, the sum of five terms of the series is 121.

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