NCO Cyber Olympiad (SOF) Class 5: Questions 1 of 633
» Verbal Reasoning » Series Completion
MCQ▾
Question
What are the next four numbers in the given sequence?
7,10,8, 11,9, 12, ________ ________ ________ ________
Choices
Choice (4)  Response  

a.  13,18,15,20 

b.  10,13,11,14 

c.  21,18,23,20 

d.  15,20,17,22 

Answer
b.
Explanation
 Here given series 7,10,8, 11,9, 12
 It means 7 + 3 =10 and 10 – 2 = 8
 8 + 3 = 11 and 11  2 = 9
 9 + 3 =12 and 12  2 = 10
 10 + 3 =13 and 13  2 = 11
 11 + 3 = 14
 So, here one time 3 added then 2 subtract so this apply alternately and sequence is 7,10,8, 11,9, 12,10,13,11, and 14.
 Alternatively we can pick alternate numbers like 7,8, 9 (increasing order of 1) and 10,11,12 (increasing order of 1 again).