Question

calcule a soma dos termos da pg (5,1,1/5...)

Answer 1

a1 = 5
a1q =1
a1q² = 1/5
q = 1:5 = 1/5 ****
n = 3

Sn = a1 ( q^n  - 1)/( q-1)
Sn = 5 [( 1/5)³ - 1 )/ 1/5
Sn = 5 [ ( 1/125 - 1/1)/ (-4/5)
Sn = 5 [ - 124/125)/ (-4/5)
Sn = (-620/125)  : ( -4/5)  = ( - 620/125) * ( -5/4 ) = 3100/500 =6,2 ***