1.

Let a, b, c be three non-coplanar vectors. Let S_(i)(i=1, 2, 3, 4, 5, 6) denonte the six scalar triple products formed by all possible permutations of a, b,c . If i, j, k, l are randomly chosen distinct numbers from 1 to 6 and if x=S_(i)/S_(j)+S_(k)/S_(l), y=S_(i)/S_(j)-S_(k)/S_(l), then x^(2)+y^(2)=

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Answer :B


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