Question

n(B) = 20, n(A ∩ B) = 10, n(A U B) =40, then find n(A) *

Answer 1

Answer:

n(A)=30

Step-by-step explanation:

n(A)+ n(B) -n(A∩B)=n(AUB)

let n(A) = x

x+20-10=40

x+10=40

x=40-10

x=30

hope this will help u

Answer 2

$\huge\underline\mathbb{\red S\pink{O}\purple{L} \blue{UT} \orange{I}\green{ON :}}$

Given that,

• n(B) = 20
• n(A ∩ B) = 10
• n(A U B) = 40
• n(A) = ?

Let,

• n(A) = x

We know that,

☯ n(A U B) = n(A) + n(B) - n(A ∩ B)

➡ 40 = x + 20 - 10

➡ 40 = x + 10

➡ x = 40 - 10

➡ x = 30

$\underline{\boxed{\bf{\purple{ ∴ n(A) = 30 }}}}$

Step-by-step explanation:

$<marquee behaviour-move><font color="green pink"><h1># PLEASE MARK ME AS BRAINLIEST✌✌✌</ ht></marquee>$