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u2 = 8
b = u2-u1
b = 8-2
b = 6
un = a+(n-1)b
u40 = 2+(40-1)6
u40 = 2+(39)6
u40 = 2+234
u40 = 236
b : 2-8 = -6
Un : a+(n-1)b
U40 : 2+ (40-1)(-6)
U40 : 2+ 39(-6)
U40 : 2+(-234)
U40 : -232
maaf kalo salah :)