Matematika

Pertanyaan

Sn=3n²+16n
Un=.........?

1 Jawaban

  • Sn = 3n² + 16n
    S3 = 27 + 48 = 75
    S2 = 12 + 32 = 44
    S1 = 3 + 16 = 19
    U3 = 75-44 = 31
    U2 = 44-19 = 25
    U1 = 19
    b = 31-25 = 6

    Un = 19-6 + 6n
    Un = 6n + 13

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