Question : Directions: Select the option related to the sixth number in the same way as the first number is related to the second number and the third number is related to the fourth number.
5 : 124 :: 6 : 215 :: ? : 511
Option 1: 15
Option 2: 7
Option 3: 8
Option 4: 9
Correct Answer: 8
Solution :
Given:
5 : 124 :: 6 : 215 :: ? : 511
Subtract 1 from the cube of the first number, to get the second number in each number pair –
Like, 5 : 124→5
3
– 1 = 124
And, 6 : 215→6
3
– 1 = 215
Similarly, follow the same pattern for ? : 511→X
3
– 1 = 511 ⇒ X
3
= 511 + 1 ⇒ X = 8
So, the missing number is 8. Hence, the third option is correct.
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