I'll do the first ten.
1, 3, 5, 7, 9, 11, 13, 15, 17, 19
The next ten are found by continuing to add two until you get to 39.
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The first 20 odd numbers are: 13579111315171921232527293133353739.
The answer is 20*20 = 400
25
There are 20 odd numbers between 19 and 57
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.