rumussukuke-nbarisanbilanganadalahUn=2n-1.nilaidariU10-U9 adalah

Un = 2n -1

U10 = 2 (10) - 1
U10 = 20 - 1
U10 = 19

U9 = 2(9) - 1
U9 = 18 - 1
U9 = 17

U10 - U9 = 19 - 7 = 2

Semoga membantu.. ^_^

Materi Barisan Aritmetika

U10 = 2(10) - 1 = 20 - 1 = 19
U9 = 2(9) - 1 = 18 - 1 = 17
Jadi,
U10 - U9 = 19 - 17 = 2