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U2 = a + b = 19
U5 = 31
U5 = a + 4b = 31
eliminasi :
a+b = 19
a+4b = 31 -
-3b = -12
b = 4
a + 4 = 19
a = 15
Sn = 1/2n (2a + (n-1)b)
S30 = 1/2 . 30 (2. 15 + (30-1) 4)
S30 = 15 . (30 + 116)
S30 = 15 . 146
S30 = 2190
u2=a+b=19
__________-
3b=12
b=4
a=31
S30=15(2.31+(30-1)4)
15(62+29.4)
15.178=2670
S30=2670