Question

Encontre o termo geral da P.A (7/13,11/4...)

Answer 1

PA = (7/13, 11/4,...)

r = a2 - a1
r = 11/4 - 7/13 ---> MMC = 4.13 = 52
r = (13.11 - 7.4)/52
r = (143 - 28)/52
r = 115/52

an = a1 + (n - 1).r
an = 7/13 + (n - 1).(115/52)
an = 7/13 + 115n/52 - 115/52
an = (7.4 + 115n - 115)/52
an = (28 + 115n - 115)/52
an = (115n - 87)/52