• # question_answer If  '+ and $'-'$ are interchanged and '4' and '8' are interchanged, then which of the following is correct? A)  $4+6-3+9=-4$           B)  $8+8-4-4=8$C) $~9+7+6-4=6\text{ }~$  D)  $4\div 8-4+8=6$

[a] $8-6+3-9=8\Rightarrow -4\ne 8$ [b] $4-4+8+8=4\Rightarrow 16\ne 4$ [c] $9-7-6+8=6\Rightarrow 4\ne 6$ [d] $8\div 4+8-4=6\Rightarrow 6=6.$