# of substring: $\dfrac{n(n+1)}{2}+1=11$
Remove $0110$ $\&$ $\epsilon$ string as they have asked only proper non-null sub-strings.
So let's write down 9 substrings:
$0,1,1,0:$
$01,11,10$
$011,110$
Some of them are repeating. Hence we have to remove them. Resulting us just with 7 sub-strings:
$0,1,01,11,10,011,110$