evaluate using identity 503*504
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\begin{gathered}503 \times 504 = (500 + 3)(500 + 4) \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 250000 + 2000 + 1500 + 12 \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 253512\end{gathered}
503×504=(500+3)(500+4)
=250000+2000+1500+12
=253512
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