Question
Select the option that is related to the third term in the
same way as the second term is related to first term and the sixth term is related to the Fifth term. 57: 82 :: 91: ?::89: 153Solution
The logic followed here is: The 2nd number is the sum of the square of the 1st digit of the 1st number and the 1st number. Similarly, the 6th number is the sum of the square of the 1st digit of the 5th number and the 5th number. So, the 4th number will be the sum of square of the 1st digit of the 3rd number and the 3rd number.
'57: 82', = [(5)Ā² + (57)] = 25 + 57 = 82.
'89: 153', = [(8)Ā² + (89)] = 64 + 89 = 153
Similarly, in '91ā: ?', = [(9)Ā² + (91) ] = 81 + 91 = 172.
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