Question Details

Which of the following options will logically replace the question mark (?) to complete the given numerical series?

-12, -25, -52, -107, -218, ?

Options

A

-439

B

-436

C

-441

D

-444

Show Answer

Correct Answer :

Option C

-441

Solution :

The correct option is -441.

To determine the missing number that logically replaces the question mark (?), let us analyze the step-by-step pattern between consecutive terms in the given numerical series:

-12, -25, -52, -107, -218, ?

Let us look at how each term is generated from the preceding term:


1st term to 2nd term: (-12)×2-1=-24-1=-25


2nd term to 3rd term: (-25)×2-2=-50-2=-52


3rd term to 4th term: (-52)×2-3=-104-3=-107


4th term to 5th term: (-107)×2-4=-214-4=-218

From the above steps, we can deduce the general rule for the pattern:
Each term is obtained by multiplying the previous term by 2 and then subtracting consecutive natural numbers (1, 2, 3, 4, 5, ...).

To find the 6th term (?), we multiply the 5th term (-218) by 2 and subtract 5:


?=(-218)×2-5


?=-436-5=-441

Therefore, the missing number in the series is -441.

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