If ( vec{a}= hat{i}- hat{j}+3 hat{k}, , vec{b}=5 hat{i}-2 hat{j}+ hat{k} ,and , vec{c}= hat{i}- hat{j} ) are such that ( vec{a}+ vec{b} ) is perpendicular to ( vec{c} ), then the value of .

If ( vec{a}= hat{i}- hat{j}+3 hat{k}, , vec{b}=5 hat{i}-2 hat{j}+ ha

1.	If ( vec{a}= hat{i}- hat{j}+3 hat{k}, , vec{b}=5 hat{i}-2 hat{j}+ hat{k} ,and , vec{c}= hat{i}- hat{j} ) are such that ( vec{a}+ vec{b} ) is perpendicular to ( vec{c} ), then the value of .
A.	( frac{7}{2} )
B.	( frac{7}{2} )
C.	( frac{3}{2} )
D.	( frac{7}{9} )
Answer» C. ( frac{3}{2} )

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