Question

*If n(A) = 5, n(A∩B) = 2, n(AUB) = 10 then n(B) = ?*

1️⃣ 7
2️⃣ 13
3️⃣ 17
4️⃣ 3​

Answer 1

Answer:

hope you will understand...

Answer 2

Given : n(A) = 5, n(A∩B) = 2, n(AUB) = 10

To Find : n(B)

1️⃣ 7

2️⃣ 13

3️⃣ 17

4️⃣ 3​

Solution:

n(AUB)  = n(A) + n(B)  - n(A∩B)

=> 10 =  5 + n(B)  - 2

=> 10 = n(B) + 3

=> n(B) = 10 - 3

=> n(B) = 7

Hence n(B)  = 7

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