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Why are effective pixels greater than the actual resolution?

This page compares Canon EOS 550D and Canon EOS 500D cameras and mentions 18.7 million effective pixels for 550D. … However the best resolution possible using this camera is 5184 * 3456 = 17915904 ~ 17.9 million pixels What are effective pixels, and why is that number greater than 17.9 million in this case? …
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