Question

Determine o 20° termo da P.A (7,9,11...)

Answer 1

$> resolucao \\ \\ \geqslant progressao \: aritmetica \\ \\ r = a2 - a1 \\ r = 9 - 7 \\ r = 2 \\ \\ \\ \geqslant \: o \: 20 \: termo \: da \: pa \\ \\ an = a1 + (n - 1)r \\ an = 7 + (20 - 1)2 \\ an = 7 + 19 \times 2 \\ an = 7 + 38 \\ an = 45 \\ \\ \\ > < > < > < > < > < >$