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TMUA 2019 Paper 2 Question 11

P2·Sequences & Series, Logic & Quantifiers·6.5Official · 2019 · Q11
arithmetic-seriesmust-be-trueinteger-constraints
An arithmetic series has terms, all of which are integers. The sum of the series is 20.
I
The first term of the series is even.
II
is even.
III
The common difference is even.
Which of these statements must be true?
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