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barisan barunya : 4, 6, 8, 10,12, 14, 16.....24
cara cari beda baru = 14-4 = 10-2/ 4 = 2
un = a + (n-1)b
24= 4 + (n-1) 2
20 = 2n -2
2n = 22
n = 11
Sn = 1/2n ( a + un)
S11 = 1/2*11( 4 + 24)
= 5,5 ( 28)
= 154