Question

25,26,40,81,? give the answer​

Answer 1

Find a missing number from a given analogy.

Find a set of numbers that are related to the same rule as the one given.

If you read newspapers you will find this section very very easy. In these kinds of questions, in bank exams, you will be asked to guess the missing number or complete a series from a given series of numbers. The tricks or the time savers here are to look for the common rules. Check for relations like “is a factor of”, “is a multiple of”, “is a root of”, “is a square of”, or a combination of these rules. Let us again see this with the help of an example:

Answer 2

Answer:

203.5

Explanation:

The given series is:

The first number is 25 and the second one is 26.

They can be related as:

$25\times \frac {1}{1}+1=26$

The second number is 26 and the third one is 40.

They can be related as:

$26\times \frac {3}{2}+1=40$

The third number is 40 and the forth one is 81.

They can be related as:

$40\times \frac {2}{1}+1=81$

Thus, in each number, every addition of $\frac {1}{2}$ and then add 1.

So,

$81\times \frac {5}{2}+1=203.5$