3. If 3, 12 and 28 are in proportional find the first proportional.

4. If A = {2,4,6,8,10,12} ,B = {3,6,9,12,15} and C = {1,2,3,4,5,6,7} then find

(A ∪ B) ∩ C .

3. If 3, 12 and 28 are in proportional find the first proportional.

4. If A = {2,4,6,8,10,12} ,B = {3,6,9,12,15} and C = {1,2,3,4,5,6,7} then find

(A ∪ B) ∩ C .