7 of them.
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There are 20 odd numbers between 19 and 57
half of (50 - 20)
7 different numbers.35711131719
The difference is 2. (23 - 21 = 2).If we are talking about two odd numbers that come right after the number 20 then we mean the two consecutive odd numbers after 20.The difference between any consecutive odd numbers (or between any consecutive even numbers) is always 2.
There are 5 odd numbers between 10 and 20: 11, 13, 15, 17, 19