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erastova [34]
2 years ago
5

Any help? I'm struggling.

Mathematics
1 answer:
Oksi-84 [34.3K]2 years ago
4 0

Answer:

Step-by-step explanation:

a=-7

r=21/-7=-3

a_{15}=a r^{n-1}=-7(-3)^{15-1}=-7(-3)^{14}=-33480783

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