Each number in the series is the sum of the previous number and one less than its numerical position in the series.
How it works in this problem:
To get from 2 to 3, add 1
To get from 3 to 5, add 2
To get from 5 to 8, add 3
To get from 8 to 12, add 4
etc.
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17 is a prime number. 8 and 12 are not prime numbers.
1.4167
It is 17.
It is 17 because (17+19)/3 = 12
To find the larger number, we can add the difference of 12 to the smaller number of 17. This gives us 17 + 12 = 29. Therefore, the larger number is 29.