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Solve number 3 please, with explanation
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Solve number 3 please, with explanation

Solve number 3 please, with explanation-example-1
User Rozie
by
5.2k points

1 Answer

2 votes

Answer:

97,655

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

User Nerdburn
by
5.3k points
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