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U₁₂ - U₅ = 145-82 = 63 = 9 (jadi beda=9)
12-5 7 7
Kita cari a (suku awal atau U₁):
Un=a+(n-1)b (rumusnya)
U₅=a+(5-1)9
82=a+(4)9
82=a+36
a=82-36
a=46 (jadi suku awal atau U₁=46)
Yg ditanya suku ke-25 atau U₂₅ :
Un=a+(n-1)b
U₂₅=46+(25-1)9
U₂₅=46+(24)9
U₂₅=46+216
U₂₅=262
semoga bermanfaat^^