# The number which is best to complete the sequence below is: 2, 9, 5, 13,10,19,17?

A series is a set of numbers following a particular pattern throughout the series.

## Answer: The number which is best to complete the sequence 2, 9, 5, 13,10,19,17 is 27.

Let’s determine the next number in this sequence.

**Explanation: **

Given: a sequence 2, 9, 5, 13,10,19,17

Basically, this is a simple alternating addition and subtraction series, a pattern to the numbers that goes like this:

from 2 to 9: +7

from 9 to 5: -4

from 5 to 13: +8

from 13 to 10: -3

from 10 to 19: +9

from 19 to 17: -2

from 17 to n; we need to find n

Looking at every alternate result, we see: +7, + 8, +9; and -4, -3, -2

The next value in the sequence +7, +8, +9 is +10. So we have 17 to n is +10,

So, the next number is 17 + 10 = 27