If 'a' is a positive integer exactly divisible by 3 or 5 but not divisible by 6.What could possibly be the value of 'a' ? Choose one:
A) 60	B) 30	C) 18	D) 27	E) 15
60 and 30 are both divisible by 3 and 5 but also by 6. so they are not the right answer.   18 and 27 are both clearly not divisible by 5(not correct)   15 is both divisible by 3 and 5 but not by 6.   answer : (15) 15
<result>E</result>
If 'a' is a positive integer exactly divisible by 3 or 5 but not divisible by 6.What could possibly be the value of 'a' ?