Question

which number should replace the question mark : 52,25,77,77,?,451,605​

Answer 1

Answer:

9999

Step-by-step explanation:

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Answer 2

Concept:

This question requires general mental ability and how to reverse numbers.

Given:

The following series is given to us,  52,25,77,77,x,451,605​

To find:

We need to the value of x in the given series.

Solution:

It is noticeable that the second digit is reversed value of the first one,

Like,

$52\rightarrow 25$

Also,

$77 \rightarrow 77$  

Therefore the value of x will be the reverse of 451.

Hence, x = 154