Hello, Shorty!

I assume there's a typo in the problem.

. . As given, it isnota geometric sequence.

You're expected to know these formulas for geometric sequences.

The term: .

The sum of the first terms: .

. . where is the first term and is the common ratio.

Find the sum of the first 12 terms of the geometric sequence: .3, 6, 12, 24 . . .

The first term is

The common ratio is

Then: .

~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~

Thevery leastyou could do is crank out the first 12 terms and add!

. .

What was stopping you?