3 years ago

Solve number 3 please, with explanation

Mathematics

1 answer:

Andreyy893 years ago

5 0

Answer:

97,655

Step-by-step explanation:

5(5)^(n-1) = 78,125

5^n = 78,125

n = 7

=> S7 = 5(5^7 -1) / (5-1)

= 5/4 (78, 125 -1)

= 5/4 (78 124) = 97,655

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