u2 = a + b = 14
u4 = a + 3b = 20
eliminasi sehingga diperoleh b = 3 dan a = 11
s16 = n(2a + (n-1)b)/2
= 16(22 + 45)/2
= 67*8 = 536
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u2 = a + b = 14
u4 = a + 3b = 20
eliminasi sehingga diperoleh b = 3 dan a = 11
s16 = n(2a + (n-1)b)/2
= 16(22 + 45)/2
= 67*8 = 536