Question

n(A) = 5, n(B) = 3, n(A ∩ B) = 0 then n(A U B) = …………​

Answer 1

Given ,

• n(A) = 5
• n(B) = 3
• n(A ∩ B) = 0

To find :—

• n(A U B)

We know that ,

★ n(A U B ) = n(A) + n(B) - n(A ∩ B)

$\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 5 + 3 - 0$

$\: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 8$