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tino4ka555 [31]
3 years ago
11

Find explicit formula for the sequence given by the recursive definition u_n= 5u_(n-1), u_1= 20

Mathematics
1 answer:
devlian [24]3 years ago
5 0

Answer:

b

Step-by-step explanation:

u1 = 20

r = 5

Un = 20 × 5^(n-1)

Un = 20 × (5^n)/5

Un = 4 × 5^n

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Step-by-step explanation:

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* For larger numbers, or ones whose factors you aren't familiar with, it can be useful to know Euclid's method for finding the greatest common factor (GCF). Divide the larger number by the smaller and keep the remainder. If the remainder is 0, the smaller is the GCF. If not, replace the larger number with the remainder and repeat.

Here, that looks like ...

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