Question

numa pg dados a1=2 , q=5 e na=1250 , calcule n

Answer 1

a1=2 , q=5 e na=1250 , calcule n


an= a1.q^(n-1)

2.5^(n-1) = 1250

5^(n-1) = 1250/2

5^(n-1) = 625

5^(n-1) = 5^4

n-1 = 4

n = 4+1

n = 5

Answer 2

an = a1. q ^ (n-1)

1250 = 2. 5 ^ (n-1)

5^(n-1) = 625    5^4 = 625

n-1 = 4
n=5