Question

a) 25 b) 20 c) 21 d) 23 e) 17​

Answer 1

Verified answer

Respuesta:

a) 25

Explicación paso a paso:

n(A u B) - n(A Δ B) = n(A n B)

18 - 13 = n(A n B)

n(A n B) = 5

n(A - B) + n(A n B) = n(A)

7 + 5 = n(A)

n(A) = 12

n(A u B) - n(A n B) + n(A) = n(A) + n(B)

n(A) + n(B) = 18 - 5 + 12

n(A) + n(B) = 25