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10,6,2--> aritmatika tingkat 1
Un= a+(n-1)b
U4=10+(4-1)-4
=-2
U5=10+(5-1)-4
=-6
U6=10+(6-1)-4
=-10
b=Un-Un-1
a=10
b=-4
maka
U4 = a+(n-1)b U5 = a+(n-1)b U6 = a+(n-1)b
= 10+(4-1).(-4) = 10+ (5-1).(-4)
= 10 + (-12) = 16
= -2