The range of these six numbers, that is, the difference between the highest and lowest numbers, is 18.
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24, they are going up in 3's, 13, 16, 19 and 18, 21 so next number is 24.
21
To determine the pattern in the series 13, 18, 16, 21, 19, we can observe that there are alternating increases and decreases by 5 and 3, respectively. Starting with 13, we add 5 to get 18, then subtract 2 to get 16, add 5 to get 21, and finally subtract 2 to get 19. Following this pattern, the next number would involve adding 5 to 19, resulting in 24.
1, 1, 2, 3, 5, 8, 13, 21... is the Fibonacci SeriesIt could as well be a series of prime numbers :1, 2, 3, 5, 7, 11, 13, 17, 19, etc.
11, 13, 15, 17, 19, 21. They are all odd numbers