Di ketahui barisan aritmatika-16,-14,-12 tentukan v10 b, s10

a = - 16
b = - 14 - ( - 16) = - 14 + 16 = 2

Un = a + ( n - 1) b
U10 = a + ( 10 - 1) b
U10 = a + 9b
= - 16 + 9(2)
= - 16 + 18
= 2

S10 = ½ . n ( a + U10)
= ½ . 10 ( - 16 + 2)
= 5 ( - 14)
= - 70