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36 = a + 2b
U5 + U7 = 144
a + 4b + a + 6b = 144
2a + 10b = 144
a + 5b = 72
cari beda
a + 5b = 72
a + 2b = 36 -
3b = 36
b = 36/3 = 12
cari suku awal
a + 2b = 36
a + (2 x 12) = 36
a + 24 = 36
a = 36-24
a = 12
S10 = 10/2 (2x12 + (10-1)12)
S10 = 5 (24 + ( 9 x 12)
S10 = 5(24 + 108)
S10 = 5 (132) = 660