1.Edrychwch ar y rhestr ganlynol o rifau. Look at the following list of numbers. 20, 21, 22, 23, 24, 25, 26, 27, 28. Gan ddefnyddio'r rhifau o'r rhestr yn unig, ysgrifennwch. Using only the numbers in the list, write down. (a) rhif ciwb, (a) a cube number,. (b) rhif cysefin, (b) a prime num
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