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xvi = 10+5+1 = 16

xvi*xvi = x*xvi + v*xvi + i*xvi = clx+lxxvv+xvi = cclvi

16*16 = 10*16 + 5*16 + 1*16 = 160+80+16 = 256

These numerals are better written out in upper case but for some reason this computer doesn't allow it.

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14y ago

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