Question

qual o 31 elemento da pa (50,52,54)?​

Answer 1

$a_1=50\\r=2\\a_{31}=?\\\\\\\displaystyle \mathsf{a_n=a_1+(n-1)\times r}\\\displaystyle \mathsf{a_{31}=50+(31-1)\times2}\\\displaystyle \mathsf{a_{31}=50+(30\times2)}\\\displaystyle \mathsf{a_{31}=50+60}\\\displaystyle \mathsf{a_{31}=110}$