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What sequence is geometric?

A. 13, 16.5, 20, …

B. 10, 7.5, 5.625, …


C. 5, 5.5, 5.55, …


D. 16, 17.1, 18.2, …​

1 Answer

6 votes

Answer:

Option B - What sequence is geometric?

B. 10, 7.5, 5.625, …​True Geometric Sequence

Explanation:

What sequence is geometric?

A. 13, 16.5, 20, …

B. 10, 7.5, 5.625, …

C. 5, 5.5, 5.55, …

D. 16, 17.1, 18.2, …​

Step-by-step solution:

Data:

a1 = 10 , r = 7.5000 , n = 3

an = a1 r n-1 --- (i)

Solution:

Now putting values in eq (i)

a3 = (10) (7.5000) 3-1

a3 = (10) (7.5000) 2

a3 = (10) (56.250)

a3 = 562.50

Now Finding the sum of the Geometric Series

a1 + a2 + a3 + ... + an

= 10 + 75 + 562.5

= 647.5

Result

Nth term value

562.50

Geometric Sum

647.5

Geometric Sequence

10, 7.5, 5.625

Hope it helps!

answered
User Skorpioh
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