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U3=a+2b=18
U7=a+6b=38
dapet b=5, a=8
S24= 24/2(8.2+23.5)
= 1572
Un = a + (n-1)b
U7 = a + 6b = 38
U3 = a + 2b = 18
--------------------------- ---
4b = 20
b = 5
substitusi:
a + 2b = 18
a + 10 = 18
a = 8
S24 = n/2 (2a +(n-1)b)
= 12 ( 16 + 23(5))
= 12 ( 16 + 115 )
= 12 (131)
= 1572