Question

dado que A1=20 e A200=1020 deteemine a soma de P,a

Answer 1

a1 = 20
a200 = 1.020
n = 200
S200 = ( a1 + a200)*100
S200 = ( 20 + 1020)* 100
S200 = ( 1040)^100

Answer 2

Sn = (a1+an).n/ 2

Sn= 20+1020 . 200 /2 

Sn= 104000