4-5 jawab ya ka please sama jalannya

4. Un = n²(n+1)
    U1 = 1²(1+1)
          = 1x 2
          = 2

    U2 = 2² (2+1)
          = 4 x 3
          = 12

   Jawaban D

5. Un = n / (n+2)
    U1 = 1 / (1+2) = 1/3
    U2 = 2 / (2 + 2) = 2/4
    Jawaban C