Bantu jawab kakk, makasiii​

Jawaban:

5

Penjelasan dengan langkah-langkah:

n(S) = n(A) + n(B) + n(A ∩ B) – n(A ∪ B)

30 = 20 + 15 + x – 10

30 = 25 + x

30 – 25 = x

5 = x