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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 value of X?

Answer»

Integers a, b, c, d are such that 5a4, 2b6, 3c8 and 4d6. If X = ab + bc + cd + da, then find the least value of X?



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