Evaluate each sequence’s related geometric series . 2,8,32,128

The general form of geometric series is ⇒  

Where a is the first term and r is the common ratio

The sum of n terms of the geometric series is ⇒

For the given geometric series  2, 8, 32, 128

The first term is a = 2

The common ratio r = 8/2 = 32/8 = 128/32 = 4

So,

And the sum of the given terms:

n = 4

∴

if a = 1,   and b = 2, then the answer is 47.99999999. if you round that to the nearest whole number, the answer is 48.

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step-by-step explanation:

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