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beda = b = -3
ditanya : U50...?
jawab : U50 = a + 49b
= 20 + 49(-3)
= 20 - 147
= -127
b = U2 - U1 = 17-20 = -3
Un = a+(n-1)xb
U50 = 20+(50-1)x(-3)
U50 = 20-147
U50 = -127
Suku 50 = -127