## Question 18

What is the next number in this sequence?

### Explanation

The next number in the series is always found by subtracting the previous number from the number before it. So you calculate the number at position 3 by subtracting the number at position 2 from the number at position 1

Watch out, subtracting a negative number is the same as adding the number.
11 - 110 = -99
110 - -99 = 209
-99 - 209 = -308
209 - -308 = 517
-308 - 517 = -825
517 - -825 = 1342

### Question statistics

Overview
Question ID: Lwz8QSV7
Main category: Numerical Reasoning
Sub category: Number sequences
Difficulty Level: 15What is item difficulty?
Average IQ of people who answered this question: 115.83
Item Response Theory (IRT)What is Item Response Theory?
Item difficulty: 15 / 20What is item difficulty?
Discrimination: 1.82 What is item discrimination?
Point of Maximum Information: 120.00 What is Point of Maximum Information?
##### Item Characteristic Curve (ICC) This Item Characteristic Curve shows the probability that a person with a given IQ level will correctly answer this question. This graph is based on the answers and the IQ levels of 1940 individual test takers who have answered this question.
Distractor AnalysisWhat is distractor analysis?
Average IQ of people who gave the correct answer: 118.70
Average IQ of people who gave an incorrect answer: 112.17