Question

Determine o 200° termo da P.A ( 7,14,21,28,...,1428

Answer 1

$\boxed{\begin{array}{l}\sf a_1=7\\\sf r=14-7=7\\\sf a_{200}=a_4+196r\\\sf a_{200}=28+196\cdot7\\\sf a_{200}=28+1372\\\sf a_{200}=1400\end{array}}$