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2(粵拼:ji6)係1同3之間嘅的自然數。佢亦係最細嘅雙數同埋第一個質數。
數字一覽 | |
小寫 | 二 |
大寫 | 貳 |
二進位 | 10 |
八進制 | 2 |
十二進位 | 2 |
十六進位 | 2 |
喺集合論入面,2被定義做{0,1}。
此數字寫法有幾類,喺各個語境,通常只得一兩種適用:
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