rhif From Wikipedia, the free encyclopedia
Rhif rhwng dau a pedwar yw tri (3). Yn y Gymraeg, tair yw'r ffurf benywaidd, a 'trydydd'/'trydedd' yw'r trefnolyn. Mae'n rhif cysefin.
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Enghraifft o'r canlynol | rhif cysefin, Mersenne prime, Fermat number, rhif triongl, rhif naturiol, odrhif, Fibonacci prime, rhif Fibonacci, Cantor number, Mersenne number, near-square prime, factorial prime, non-negative integer, power of three, harshad number, primorial prime, Euclid number ![]() |
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Y gwrthwyneb | −3, ⅓ ![]() |
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