Example:
If, n(A) = 7, n(B) = 8 and n(A Ç B) = 3, then find the value of n(A È B). Solution:
Ginve that, n(A) = 7, n(B) = 8 and n(A Ç B) = 3.
Formula for the above prolblem is n(A È B) = n(A) + n(B) - n(A Ç B).
= 7 + 8 -3
= 15 - 3
n(A È B) = 12.
Note:
n(A) means the number of elements in A it is read as cardinal number of A.
Directions: Choose the correct answer. Also write at least 5 examples of your own.