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### High School Mathematics7.3 Problems on Sets

 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.
 Q 1: If n(A) = 4, n(B) = 7 and n(A Ç B) = 2, then find the value of n(A È B).6795 Q 2: If n(A) = 7, B = {3, 4, 5, 6, 7, 8, 9} and n(A Ç B) = 4, then find the value of n(A È B).10879 Q 3: If A = {1, 2, 3, 4, 5}, n(B) = 6 and n(A Ç B) = 3, then find the value of n(A È B).8354 Q 4: If n(A) = 8, B = {1, 2, 3, 4, 5, 6, 7, 8, 9} and n(A Ç B) = 5, then find the value of n(A È B).10111312 Q 5: If n(A) = 6, n(A Ç B) = 4 and n(A È B) = 10, then find the value of n(B).8756 Q 6: If n(A) = 8, n(B) = 15 and n(A Ç B) = 6, then find the value of n(A È B).17131115 Question 7: This question is available to subscribers only! Question 8: This question is available to subscribers only!