ni tolong bantu sama caranya

n(S) = n(A) + n(B) - n(AnB) + n(AuB)'
110 = 75 + 45 + 20 - n(AnB)
n(AnB) = 140 - 110 = 30

memilih pmr saja n(B) - n(AnB) = 45-30 = 15 siswa

nomor 2
n(S) = n(A) + n(B) - n(AnB) + n(AuB)'
32 = 12 + 15 - 4 + n(AuB)'
n(AuB)' = 32 - 23 = 9 siswa