Test Index

Series and Odd Man out Practice Test 1

Question : 14 of 40

Marks: +1, -0

16, 17, 21, 30, 45, 71, 107

Solution:

Concept:

Identify the term that breaks the pattern of successive differences.

Explanation:

Find differences between consecutive terms:

17-16=1=1^2

21-17=4=2^2

30-21=9=3^2

45-30=15

should be

16=4^2

71-45=26

should be

25=5^2

107-71=36=6^2

45

is replaced by

46

, the differences become:

1,4,9,16,25,36

These are perfect squares from

1^2

6^2

So the wrong term is

45

Answer:

45

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