1.)5,9,13.17…Tentukan U10 dan S10?2.)3,6,12,24..Tentukan U7 dan S6

1)
a = 5
b = 9-5 = 4
maka,
U10
= a+9b
= 5+9.4
= 5+36
= 41

Sn = n/2 x (a+Un)
maka,
S10
= n/2 x (a+U10)
= 10/2 x (5+41)
= 5 x 46
= 230