Question

Calcule o 20º termo da P.A (-50,-48,...)

Answer 1

a₁ = - 50

r = - 48 - ( -50) -----r = - 48 + 50 ---- r = 2

a₂₀ = - 50 + (20 - 1) . 2 ----- a₂₀ = - 50 + (19) . 2 ---- a₂₀ = - 50 + 38 --- a₂₀ = - 12