Question

encotren o 50° e 80° termo de PA (9,15...)

Answer 1

a1 = 9
r = 15-9 = 6

an = a1 + (n-1)r

a50
= 9 + (50-1) . 6
= 9 + 49 . 6
= 9 + 294
= 303

a80
= 9 + (80-1) . 6
= 9 + 79 . 6
= 9 + 474
= 483