Set A consists of the integers from 4 to 15, inclusive, while set B consists of the integers from 7 to 20, inclusive. How many distinct integers do belong to the both sets at the same time?	Choose the correct choice from the following choices
A) 5	B) 7	C) 8	D) 9	E) 10
A={4,5,6,7,8,9,10,11,12}   B={6,7,8,9,10,11,12...}   Thus we see that there are 9 distinct integers that are common to both. 9 is the correct answer.
<result>D</result>
Set A consists of the integers from 4 to 15, inclusive, while set B consists of the integers from 7 to 20, inclusive. How many distinct integers do belong to the both sets at the same time?