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
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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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