Question : Directions: In the following question, select the missing number of the given series.
10, 9, 17, –10, 54, ?
Option 1: –71
Option 2: –82
Option 3: –67
Option 4: –103
Correct Answer: –71
Solution :
Given:
10, 9, 17, –10, 54, ?
The pattern is as follows –
10 – (1)
3
= 10 – 1 = 9
9 + (2)
3
= 9 + 8 = 17
17 – (3)
3
= 17 – 27 = –10
–10 + (4)
3
= –10 + 64 = 54
54 – (5)
3
= 54 –125 = –71
So, the missing number of the series is –71. Hence, the first option is correct.
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