Question

determine o termo 50° da P.A ( 5,9,13,17,...)

Answer 1

a 50 = ?
P.A.(5;9;13;17;...)
r = a 2 - a 1
r = 9 - 5
r = 4
a 50 = a 1 + (n - 1 ).r
a 50 = 5 + (50 - 1 ).4
a 50 = 5 + (49 . 4)
a 50 = 5 + 196
a 50 = 201