No of variables in Boolean expression is 3 i.e A,B,C
Number of input combinations.
[tex]\\ \sf\longmapsto 2^n[/tex]
[tex]\\ \sf\longmapsto 2^3[/tex]
[tex]\\ \sf\longmapsto 8[/tex]
It will follow the octal table.
000
001
010
011
100
101
110
110
We know the rule .
So
no of outputs which are 1=8-1=7.