Select the option that is related to the third number in the same way as the second number is related to the first number.
3 : 128 :: 5 : ?
Answer & explanation
Correct answer: option 1
The correct answer is Option (1) → 432
In a number analogy, find the operation that turns the first number into the second, then apply it to the third number. 128 is twice 64, and 64 is the cube of 4, the number just after 3.
\(3+1=4\), and \(4^3=64\)
\(2\times64=128\), so the rule is: add 1, cube the result and double it
For 5: \(5+1=6\), and \(6^3=216\)
\(2\times216=432\)
So the missing number is 432.