Each number except 380 is either one more or one less than the square of a certain number.

Correct Option: D

Each number except 380 is either one more or one less than the square of a certain number.

49 is the only perfect square; rest are just random numbers.

Correct Option: C

49 is the only perfect square; rest are just random numbers.

315 is the odd one out as the rest all are squares of different numbers.

Correct Option: D

315 is the odd one out as the rest all are squares of different numbers.

The unit digit remains same, and the thousand place, hundredth place and tenth place changes and follow particular pattern except in 5686.

Correct Option: D

The unit digit remains same, and the thousand place, hundredth place and tenth place changes and follow particular pattern except in 5686.

3781 is the odd one out as other numbers contain only odd digits.

Correct Option: B

3781 is the odd one out as other numbers contain only odd digits.