30, 20, 10, 0, …, …, … A. -10, -20, -30 B. -30, -40, -50 C. -30, -20, -10 D. -50, -40, -30

By Admin ReiPosted on December 4, 2022

30, 20, 10, 0, …, …, … A. -10, -20, -30 B. -30, -40, -50 C. -30, -20, -10 D. -50, -40, -30

$un = a + (n - 1)b \ u5 = 30 + (5 - 1)( - 10) \ u5 = 30 + (4)( - 10) \ u5 = 30 - 40 \ u5 = - 10 : (a)$