Question : Directions: Find out the wrong number from the given series.
5, 27, 61, 122, 213, 340, 509
Option 1: 27
Option 2: 61
Option 3: 122
Option 4: 509
Correct Answer: 27
Solution :
Given:
5, 27, 61, 122, 213, 340, 509
The following pattern is being followed in the given series –
(2)
3
– 3 = 8 – 3 = 5;
(3)
3
– 3 = 27 – 3 = 24
≠ 27;
(4)
3
– 3 = 64 – 3 = 61;
(5)
3
– 3 = 125 – 3 = 122;
(6)
3
– 3 = 216 – 3 = 213;
(7)
3
– 3 = 343 – 3 = 340;
(8)
3
– 3 = 512 – 3 = 509
So, 27 is the wrong number in the series. Hence, the first option is correct.
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