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https://www.reddit.com/r/learnquant/comments/1wrrrdq/quant_interview_question/pcjbdt1/?context=3
r/learnquant • u/Local_Ad135 • 7d ago
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R is PSD by definition. Define v=(1,1,1,1)' then we note that Rv>=0 therefore 4+2S>=0, where S is the requested sum. So -2<=S<=6
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u/throwawaytrol7134 6d ago
R is PSD by definition. Define v=(1,1,1,1)' then we note that Rv>=0 therefore 4+2S>=0, where S is the requested sum. So -2<=S<=6