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u7= a + 6b = 38 -
4b = 20
b = 5
a + 2b = 18
a + 10 = 18
a = 8
s24 = 1/2n ( 2a + (n-1) b
= 1/2*24 ( 2*8 + (23) 5
= 12 ( 16 + 115)
= 12(131)
=1.572
cari suku awal
U3 =a +(3-1)b
18 = a + 2b
18 = a + ( 2 x 5)
18 = a + 10
18-10 = a + 10 -10
8 = a
maka a=8, b = 5
S24 = 24/2 (2a+(n-1)b)
S24 = 12 (2x8 + (24-1)5)
S24 = 12 (16 + (23 x 5)
S24 = 12(16 + 115)
S24 = 12 (131)
S24 = 1572