PPSC Excise and Taxation Inspector 2018 Question Paper

Practice Mode:
60.

Find the wrong number in the series :

125 , 126 , 124 , 127 , 123 , 129

A: 126
B: 124
C: 123
D: 129

The answer is: D

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Explanation

Answer: D) 129

Pattern Analysis:

PositionNumberOperation
125Start—
126+1✓
124−2✓
127+3✓
123−4✓
129should be +5 = 128✗

The Rule: +1, −2, +3, −4, +5...

So after 123, the next number should be 123 + 5 = 128, not 129.

129 is the wrong number.