Answer :
Final answer:
The odd one out is 25-50-75 (option A).
Explanation:
Out of the given options, the numbers in all other sets follow a specific pattern or rule.
For example, in the set 5-15-20, each number is obtained by multiplying the previous number by 3.
Similarly, in the set 10-30-40, each number is obtained by multiplying the previous number by 3 as well. In the set 4-12-15, each number is obtained by multiplying the previous number by 3/2.
However, in the set 25-50-75, the numbers do not follow any clear pattern or rule.
Therefore, it is the odd one out.
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