Question : Directions: Find the wrong number in the following series.
16, 16, 17, 21, 27, 46, 71
Option 1: 27
Option 2: 46
Option 3: 16
Option 4: 71
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Correct Answer: 27
Solution :
Given:
16, 16, 17, 21, 27, 46, 71
Add the square of the consecutive whole numbers to the previous term to obtain the next term –
16 + (0)
2
= 16; 16 + (1)
2
= 17; 17 + (2)
2
= 21; 21 + (3)
2
= 30 ≠ 27; 30 + (4)
2
= 46; 46 + (5)
2
= 71
So, 27 is the wrong term in the given series. Hence, the first option is correct.
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