Correct Answer:
B. 54
All numbers in the given series except 54 are multiples of 5. Therefore, 54 is the odd one out as it does not fit this numerical pattern, unlike 10, 45, or 75.
All numbers in the given series except 54 are multiples of 5. Therefore, 54 is the odd one out as it does not fit this numerical pattern, unlike 10, 45, or 75.