Let $a, b, c \;\text{and}\; d$ be different positive integers, and it is known that $a+b+c+d+e=20$. What is the maximum value of $a·b+c·d+e$?
Can someone give an answer and the steps to answer it? I'm still studying here, please help
2026-04-27 12:31:43.1777293103
Maximum value determination
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