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Question
If a = 3, b = 0, c = 2 and d = 1, find the value of ab − bc + cd − da
Sum
Solution
ab − bc + cd − da
= 3 × 0 − 0 × 2 + 2 × 1 − 1 × 3
= 0 + 0 + 2 − 3
= − 1
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Concept of Substitution
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