Question

Qual é o 15termodaPA(1,4,7,10...)

Answer 1

$a_1 = 1$

$r = 3$

$a_{15} = ?$

$a_n = a_1 + (n-1)r$

$a_{15} = 1 + (15-1)3$

$a_{15} = 1 + 14.3$

$a_{15} = 1 + 42$

$a_{15} = 43$