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ExtremeBDS [4]
3 years ago
6

Find an explicit rule for the nth term of the sequence.

Mathematics
1 answer:
Sphinxa [80]3 years ago
7 0

Step-by-step explanation:

in a geometric sequence there is a constant factor x that is multiplied with every previous term to create the next one.

a2 = 20

a5 = 1280 = a2×x×x×x = a2×x³ = 20x³

64 = x³

x = 4

=> a1 = 5

therefore

an = an-1×4 =

a1 \times  {4}^{n - 1}

n > 1

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