Question

Resolva letra A e B ( com cálculos )

Answer 1

A
PA[ 3,5,7,9,11,13,15,17,19,21,23,35,27,29,31,33]
a1 = 3
r = 2
n = 12
a12 = a1 + 11r
a12 = 3 + 11(2)
a12 =3 + 22 = 25 ***

b
a1 = 3
r = 2
S30 =  ( a1 + a30)*15
a30 = a1 + 29r
a30 =  3 + 29r
a30 = 3 + 29(2)
a30 = 3 +  58 = 61 ****
S30 = ( 3 +  61)*15
S30 = 64 * 15 = 960 ***