Tolong dong jawab, besok disetorkan

11) Un   = a+(n-1)b
      U10 = 2+(10-1)2
      U10 = 2+9.2
      U10 = 20 (c)

13) S = {1, 2, 3, 4, ..., 10}
      A = {2, 4, 6, 8}
      B = {2, 3, 5, 7}

A∩B = {2}
A = {4, 6, 8}
B = {3, 5, 7}
(A∪B)* = {1, 9, 10}

* : complement
Jawaban = (B)

14) Misalkan : -B → Kota Bandung
                       - Y→ Kota Surabaya
Diket : -S = 40 siswa
           -B = 24 siswa
           -Y = 16 siswa
           -(B∪Y)* = 5 siswa
Ditanya : (B∩Y) ?

Jawab :

S = B + Y - (B∩Y) + luar
40 = 24 + 16 - x + luar
40 = 45 - x
x = 45-40
x = 5 siswa (a)