Question

o vigésimo termo da P.A( 1,3,5, 7, 9...) é:
a) 11
b) 26
c) 39
d) 46​

Answer 1

$a_{20} = a_{1} + 19r \\ a_{20} = 1 + 19 \times 2 \\ a_{20} = 39$

letra C.

Answer 2

Resposta correta letra c 39