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OpenStudy (anonymous):
Please check this answer If c & d = c2 + d2 - 4, then 2 & 1 = __. My answer is -1
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OpenStudy (anonymous):
you plug in 2 and 1 into c and d in the equation so you have 2 & 1 = (2)*2 + (1)*2 - 4 = 2
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