Look at the series of numbers in the riddle and guess the next 2 numbers in the series.
What Comes Next In The Sequence:
17, 17, 34, 20, 20, 31, 23, ?, ?
If you get the correct answer, share it with your friends on WhatsApp, Facebook and other social networking sites.
This is an alternating subtraction series with repetition. There are two different patterns here. In the first, a number repeats itself; then 3 is added to that number to arrive at the next number, which also repeats. This gives the series 17, 17, 20, 20, 23, and so on. Every third number follows a second pattern, in which 3 is subtracted from each number to arrive at the next: 34, 31, 28.
So the next 2 numbers are: 23, 28
One Reply to “What Comes Next In The Sequence: 17, 17, 34, 20, 20, 31, 23, ?, ?”
This series is a combination of two series. The first series is 17, 17, 20, 20, ? This is formed leaving out the every third digit. The next series is take every third digit and forma series. E.g., 34, 31, ? If we observe the first series, we notice one number is repeated twice that is 17 and 20. the next number is obtained by adding 3 to the previous number. e.g., 17+3 =20; 20+3 =23; Continuing in this way we get the next number is 23. Now come to the second series: 34, 31, ? Here if we observe, every next number is obtained by subtracting 3 from the previous number. e.g. 34 -3 =31; Applying the same logic we can get the next number as 31-3 =28. So the answer is 23, 28. M J SUBRAMANYAM, BANGALORE