tolong jawab y kak no 17-18

Kelas 7 Matematika
Bab Himpunan

17] Semua siswa = s
Senang Matematika = a
Senang Fisika = b

n(s) = n(a) + n(b) - n(anb) + n(aub)'
30 = 20 + 15 - 10 + n(aub)'
n(aub)' = 30 - 25
n(aub)' = 5 siswa

18] Semua siswa = s
Senang sepak bola = a
Senang bulu tangkis = b

n(s) = n(a) + n(b) - n(anb) + n(aub)'
25 = 20 + 15 - n(anb) + 3
n(anb) = 38 - 25
n(ann) = 13 siswa