Question

Let A= {x: X is poisitve integral multiple of 3 less than 31} and B={ x: X is prime number less than 30} then n(AUB) + n(A intersection B) is equal to
option is :(a) 20 (b) 21 (c) 10 (d) none of these : which one is coreect​

Answer 1

Answer:

17

Step-by-step explanation:

A=(3, 6, 9, .......,27, 30)

n(A)=10

B= (2, 3, 5, 7, 11 , 13 ,17 ,19)

n(B)=8

after calculating

n(A union B) = 16

n(A intersection B) = 1

therefore the sum of cardinal no. of these two will be 17 Ans.

HOPE IT HELPS