Answer:
12.3
Step-by-step explanation:
Let

be the

th partial sum of a geometric sequence with common ratio

and first term

. So the sequence is

, and

is

Multiplying both sides by

gives

and subtracting

from

gives



If

, then

as

and so the sum approaches
Answer:
let the number be x
wo a/q we have,
4x + 5 = 7
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