Introduction to counting & probability 排列组合入门
introduction to counting
计数入门
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Changes in ballot design and the introduction of electronic counting possibly led, either directly or indirectly, to an increase in rejected ballots.
BBC: NEWS | UK | Scotland | Ballot paper report at-a-glance
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