Question

num P.G dados a1= 2, q=5 e an=1250 calcule n.

Answer 1

Formula: an= a1.q^n-1

1250= 2.5^n-1
1250/2= 5^n-1
625= 5^n-1
5⁴= 5^n-1
n-1= 4
n= 4+1
n= 5