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if this is a serious question then this is a possible answer ml is millilitre (volume) mg is milligram ( weight ) so a ml of something might be more than a mg less than a mg or equal to a mg you can only compare them if you use a specific substance
Any metric unit would do. But it might be easier to pick something smaller than the length of the pencil, like a centimeter, or a millimeter.
you use it when you laern something.................
Use the division algorithm. If b = pa + r, then gcd(b,a) = gcd(a,r). Then you can apply the division algorithm again with a = qr + r' and gcd(a,r) = gcd(r, r'). Note that each time the square norm of the remainder gets smaller and smaller, so eventually this process will terminate and you can get the answer. Here, it should be 1.