B. Find the intersection of each of the following

4. A = {1, 4, 9, 16}
B = {3, 6, 9, 12}

A U B =__________

5. X = {letters of word BIOLOGY}
Y = {letters of word PHYSICS}

X U Y = __________

6. W = (x/x is a whole number less than 4}
N = {x/x is a natural number between 4 and 10}

W U N =__________​