Question : Directions: In the following question, select the related number from the given alternatives.
8 : 63 :: 9 : ?
Option 1: 80
Option 2: 81
Option 3: 56
Option 4: 32
Correct Answer: 80
Solution :
Given:
8 : 63 :: 9 : ?
Subtract 1 from the square of the first number to get the second number of the given pair.
Like, 8 : 63→(8)
2
= 64; 64 – 1 = 63
Similarly, 9 : ?→(9)
2
= 81; 81 – 1 = 80
Hence, the first option is correct.
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