Question

Dada a P.A (1,3,5,...) Calcule:
a) sexto termo. b) o décimo termo

Answer 1

$\boxed{\sf a_n=a_1+(n-1)\cdot r}$

$\sf a_6=1+(6-1)\cdot2$

$\sf a_6=1+5\cdot2$

$\sf a_6=1+10$

$\boxed{\boxed{\sf a_6=11}}$

$\sf a_{10}=1+(10-1)\cdot2$

$\sf a_{10}=1+9\cdot2$

$\sf a_{10}=1+18$

$\boxed{\boxed{\sf a_{10}=19}}$