Question

Find the incorrect number,25,36,49,81,121,169,225

Answer 1

The correct sequence is 5², 7², 9², 11², 13², 15².

So, 36 is incorrect.

Hope this helps you out.

Answer 2

Given:

A sequence: 25,36,49,81,121,169,225

To find:

The incorrect number in the sequence

Solution:

The incorrect number in the sequence is 36.

We can find the number by following the process given below-

We know that the given sequence follows a particular pattern.

On looking at the given numbers, we can notice that the numbers are squares of 5, 6, 7, 9, 11, 13, 15.

5²=25

6²=36

7²=49

9²=81

11²=121

13²=169

15²=225

The numbers 5, 7, 9, 11, 13, 15 are odd.

Here, all the numbers which have been squared to form the sequence except 6 are odd.

The correct sequence must consist of the squares of only odd numbers since they are greater in number.

The correct sequence= 25, 49, 81, 121, 169, 225

36 is the square of 6 which is even.

So, 36 is the incorrect number.

Therefore, the incorrect number in the sequence is 36.