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U₅=172
Maka U₁₁?
Cari dahulu suku awal dan beda:
U₇=U₅+(7-5)b
100 = 172+2b
2b=100-172
2b= -72
b= -72
2
b= -36
U₅=U₁+(5-1)b
172=a+4b
a=172-4b
a=172-4.(-36)
a=172+144
a=316
maka U₁₁:
U₁₁=a+(n-1)b
=316+(11-1).-36
=316-360
= -44
Jelas ya.