K is short for kilo, Latin for thousand. 2k is two thousand. If you're talking about a race, it refers to kilometers.
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1k notation would stand for 1000 Therfore 2k would be 2000.
Suppose N stands for any number. Then 2N will always be even, so 2N + 1 will always be odd. Now let K stand for any other number. Then 2K + 1 will be another odd number. Now suppose we add these two odd numbers ; 2N + 1 + 2K + 1 = 2N + 2K +2 Factor out a 2, 2(K + N + 1) So the result of adding two odd numbers always gives a number which has the factor 2. So it is always an even number. Now add an even number 2N with an odd number 2K + 1 to get; 2N + 2K +1 . Since 2N + 2K is always an even number (has the factor 2 ) then 2N + 2K + 1 will always be an odd number.
2K = 2KM = 2 Kilometers = 2000 meters
2k - 1 = 0 Add 1 to both sides: 2k = 1 Divide both sides by two: k = 0.5
1k/2k, 2k/4k, 3k/6k and so on.