Set A consists of the integers from 3 to 12, inclusive, while set B consists of the integers from 6 to 20, inclusive. How many distinct integers do belong to the both sets at the same time?
Choose the correct choice from the following answers.
A) 5
B) 7
C) 8
D) 9
E) 10
A={3,4,5,6,7,8,9,10,11,12}   B={6,7,8,9,10,11,12...}   Thus we see that there are 7 distinct integers that are common to both. 7 is the correct answer.
<result>B</result>
Set A consists of the integers from 3 to 12, inclusive, while set B consists of the integers from 6 to 20, inclusive. How many distinct integers do belong to the both sets at the same time?