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Question
If x = 1, y = 2 and z = 5, find the value of xy + yz − zx
Solution
Substituting x = 1, y = 2 and z = 5 in the given expression:
\[(1 \times 2) + (2 \times 5) - (5 \times 1) = 2 + 10 - 5\]
\[ = 7\]
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