Choose the odd one:

The correct answer is 4, 16, 36.

To find the odd one out, let us analyze the pattern followed by the numbers in each given option:

1. Option 1: 2, 4, 8
Each subsequent number is generated by multiplying the previous number by 2 (powers of 2):
2¹ = 2
2² = 4
2³ = 8
This group follows the pattern of powers of 2 (or a geometric progression with a ratio of 2).

2. Option 2: 3, 9, 27
Each subsequent number is generated by multiplying the previous number by 3 (powers of 3):
3¹ = 3
3² = 9
3³ = 27
This group follows the pattern of powers of 3 (or a geometric progression with a ratio of 3).

3. Option 3: 5, 25, 125
Each subsequent number is generated by multiplying the previous number by 5 (powers of 5):
5¹ = 5
5² = 25
5³ = 125
This group follows the pattern of powers of 5 (or a geometric progression with a ratio of 5).

4. Option 4: 4, 16, 36
Let us check the powers of 4:
4¹ = 4
4² = 16
4³ = 64 (not 36)
Here, 36 is 6², which breaks the geometric power progression (x, x², x³) followed by all the other three options.

Therefore, 4, 16, 36 does not follow the same rule as the others and is the odd one out.