The battery life for Bruhier's cell phone is longer when he has fewer apps running. When only one app is running, the battery wi
2 answers:
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Answer:
Step-by-step explanation:
The sum you are trying to understand is this.
Remember that in general when you have a geometric series
you have that
and that equality is true as long as
.
Therefore here we have
and
Therefore we can use the formula and