Question

If n(A)=10 and n(B)=25and n(A U B) = 40 then n(A ∩ B)= ?

Answer 1

Answer:

Step-by-step explanation:

If n(A)=10 and n(B)=25and n(A U B) = 40

n(A U B) = 40

this means

then

a + b = a(total)b - a(common)b ----formula

10 + 25 = 40 - n(A ∩ B)

n(A ∩ B) = 5

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