Question : Directions: In the following question a series is given, with one or more number(s) missing. Choose the correct alternative from the given ones that will complete the series.
22, 22, 23, 20, 16, 17, 17, ?, ?, 8
Option 1: 18, 9
Option 2: 12, 13
Option 3: 10, 9
Option 4: 13, 10
Correct Answer: 13, 10
Solution :
Given:
22, 22, 23, 20, 16, 17, 17, ?, ?, 8
Odd position terms – The series follows a pattern of +1, –7, +1, –7, and so on.
22 + 1 = 23; 23 – 7 = 16; 16 + 1 = 17; 17 – 7 = 10
Even position terms – The series follows a pattern of –2, –3, –4, and so on.
22 – 2 = 20; 20 – 3 = 17; 17 – 4 = 13
So, the two missing terms are 13 and 10. Hence, the fourth option is correct.
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