Question

determine a91° termo da p.a (2,4)

Answer 1

$a1 = 2 \\ a2 = 4 \\ r = 2 \\ a91 = \\ \\ an = a1 + (n - 1) \times r \\ \\ a91 = 2 + (91 - 1) \times 2 \\ a91 = 2 + (90) \times 2 \\ a91 = 2 + 180 \\ a91 = 182$