## Question 15

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.
8 - 56 = -48
56 - -48 = 104
-48 - 104 = -152
104 - -152 = 256
-152 - 256 = -408
256 - -408 = 664

### Question statistics

Overview
Question ID: owxAM9XV
Main category: Numerical Reasoning
Sub category: Number sequences
Difficulty Level: 15What is item difficulty?
Nr of times answered: 2618
Average IQ of people who answered this question: 110.72
Percentage of answers correct: 51.64%
Item Response Theory (IRT)What is Item Response Theory?
Item difficulty: 15 / 20What is item difficulty?
Discrimination: 1.46 What is item discrimination?
Point of Maximum Information: 115.04 What is Point of Maximum Information?
##### Item Characteristic Curve (ICC)
Distractor AnalysisWhat is distractor analysis?
Average IQ of people who gave the correct answer: 113.07
Average IQ of people who gave an incorrect answer: 108.09

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