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Given that,

- $A(x,y)=x+y$
- $M(x,y)=xy$
- $S(x,y)=x−y$
- $D(x,y)=x/y;y\ne0$

Now, the value of $M(M(A(M(x,y),S(y,x)),x),A(y,x))$ for $x=2,y=3:$

$\Rightarrow M(M(A(M(2,3),S(3,2)),2),A(3,2))$

$\Rightarrow M(M(A(6,1),2),5)$

$\Rightarrow M(M(7,2),5)$

$\Rightarrow M(14,5)$

$\Rightarrow 70$

Correct Answer $:\text{D}$