Question

Qual o 18º termo da PA 2, 5, 8

Answer 1

$\Large\boxed{\begin{array}{l}\sf(2,5,8\dotsc)\\\sf r=5-2=3\\\sf a_{18}=a_3+15r\\\sf a_{18}=8+15\cdot3\\\sf a_{18}=8+45\\\sf a_{18}=53\end{array}}\checkmark$

Answer 2

$> resolucao \\ \\ \geqslant progressao \: aritmetica \\ \\ r = a2 - a1 \\ r = 5 - 2 \\ r = 3 \\ \\ \geqslant o \: 18 \: termo \: da \: pa \\ \\ an = a1 + (n - 1)r \\ an = 2 + (18 - 1)3 \\ an = 2 + 17 \times 3 \\ an = 2 + 51 \\ an = 53 \\ \\ \\ > < > < > < > < > < > > >$