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ini ya caranya heheheeheh
U5= 34
U5 = a + (n-1)b
U5= a + 4b
U5= (a + b )+ 3b
U5 = 46 + 3b
3b = 46-34
3b=12
b= 4
U2 = a+ b
46 = a + 4
a = 42
Sn = ankuadrat + 1/2 bn kuadrat - 1/2 bn
Sn= 42 * 40kuadrt + 1/2 4.40kuadrt - 1/2 4.40
Sn = 42 * 1600 + 3200 - 80
Sn = 67200 +3200- 80
Sn= 70320