Integers a - b - c - d are such that -5 - a - 4-2 - b - 6-3 - c - 8 and -4 - d - 6 - If X - ab - bc - cd - da- then find the least valueof X -A- -96B- -72C- 48D- -144

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Solving Inequalities

Integers a , ...

Question

Integers a, b, c, d are such that $- 5 \leq a \leq 4, - 2 \leq b \leq 6, - 3 \leq c \leq 8 a n d - 4 \leq d \leq 6$ . If X = ab + bc + cd + da, then find the least value of X?

-96

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-72

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-144

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