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Suku ke 6 = 47
Suku ke 15 = ?
Jawaban =
Memakai rumus => 6.n -1 + (n.2)
Coba :
= 6.4-1+(4.2)
= 24-1+8
= 23+8
= 31
= 6.6-1+(6.2)
= 36-1+12
= 35+12
= 47
Sekarang menghitung suku ke 15 :
= 6.15-1+(15.2)
= 90-1+30
= 89+30
= 119
Jadi, jawabannya yaitu 119 ( n = suku )