Except for option D, all others follow the same logic.

9^2 = 81 => 9 + (9+1) = 19

11^2 = 121 => 11 + (11+1) = 23

1^2 = 1 => 1 + (1+1) = 3

8^2 = 64 => 8 + (8+1) = 17

Hence, option D is the correct answer.

Except for option B, all others follow the same logic.

H + 4 = L => L + 3 = O => O + 1 = P

F + 2 = H => H + 2 = J => J + 2 = L

A + 4 = E => E + 3 = H => H + 1 = I

Q + 4 = U => U + 3 = X => X + 1 = Y

Hence, option B is the correct answer.

Except for option D, all others follow the same logic –

P + 4 = T => T + 4 = X => X + 4 = B

M + 4 = Q => Q + 4 = U => U + 4 = Y

G + 4 = K => K + 4 = O => O + 4 = S

H + 3 = K => K + 3 = N => N + 3 = Q

Hence, option D is the correct answer.

The logic here is that the cube of the first number is increased by the number itself to get the second number –

3³ + 3 = 30

6³ + 6 = 222

7³ + 7 = 350

But,

4³ + 4 = 68 and not 70

Hence, option A is the correct answer.

The logic here is that the forst letter is decreased by -2, the third letter is the reverse of first letter –

C (3) – 2 = A (1) and C Reverse X i.e. CAX

A (1) – 2 = Y (25) and A Reverse Z i.e. AYZ

F (6) – 2 = D (4) and F Reverse U i.e. FDU

But,

H (8) – 2 = F (6) and not D (4)

Hence, option D is the correct answer.

Except for option B, all others follow the same logic.

6286 – 4321 = 1965

6571 – 4321 = 2250

8247 – 4321 = 3926

6903 – 4321 = 2582

Hence, option B is the correct answer.

Except for option A, all others follow the same logic.

R + 4 = V => V

A + 3 = D => D = reverse = W

E + 3 = H => H = reverse = S

J + 3 = M => M = reverse = N

Hence, option A is the correct answer.

Except for option B, all others follow the same logic.

T ó G, W ó D

A ó Z, D + 1 = E

P ó K, S ó H

F ó U, I ó R

Hence, option B is the correct answer.

Except for option B, all others follow the same logic.

M + 3 = P => P – 6 = J

D + 5 = I => I – 7 = B

H + 3 = K => K – 6 = E

T + 3 = W => W – 6 = Q

Hence, option B is the correct answer.

Except for option A, all others follow the same logic.

C – 1 = D => D – 6 = X => X – 1 = W

J = reverse = Q, K = reverse = P

F = reverse = U, G = reverse = T

H = reverse = S, I = reverse = R

Hence, option A is the correct answer.