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Встанови відповідність var letters = "ABCDE" .Select((c,i)=> new { c, pos=i...

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Встанови відповідність

var letters = "ABCDE"
    .Select((c,i)=> new { c, pos=i })
    .Where(x=>x.pos%2==0);

]]>

letters.Count()

letters.First().c

letters.Last().pos

string.Concat(letters.Select(x=>x.c))

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