The options of this question are
1) 6 2) 8 3) 11 4) 15
Verify each option
option 1
number 6 is ivisible by 2 and is divisible by 3.
option 2
number 8 is divisible by 2
option 3
number 11
is not divisible by 2 and not is divisible by 3
option 4
number 15 is divisible by 3
therefore
the answer is the option 3