The logic here is that the first letters are reduced by -4, second letters are increased by +6, third letters are reduced by -8 and fourth letters are increased by +10 –

T (20) – 4 = P (16) – 4 = L (12) – 4 = H (8) – 4 = D (4)

V (22) + 6 = B (2) + 6 = H (8) + 6 = N (14) + 6 = T (20)

E (5) – 8 = W (23) – 8 = O (15) – 8 = G (7) – 8 = Y (25)

Q (17) + 10 = A (1) + 10 = K (11) + 10 = U (21) + 10 = E (5)

Hence, option B is the correct answer.

6 x 3 + 4 = 22

22 x 3 + 4 = 70

70 x 3 + 4 = 214

214 x 3 + 4 = 646

646 x 3 + 4 = 1942

Hence, option A is the correct answer.

S – 3 = P => P – 3 = M => M - 3 = J => J – 3 = G

R – 3 = O => O - 3 = L => L – 3 = I => I - 3 = F

Q – 3 = N => N – 3 = K => K – 3 = H => H – 3 = E

Hence, option A is the correct answer.

The logic here is that the first letters are reduced by -3, the second letters are increased by +2, the third letters are reduced by -1 –

S (19) – 3 = P (16) – 3 = M (13) – 3 = J (10) – 3 = G (7)

K (11) + 2 = M (13) + 2 = O (15) + 2 = Q (17) + 2 = S (19)

H (8) – 1 = G (7) – 1 = F (6) – 1 = E (5) – 1 = D (4)

Hence, option A is the correct answer.

The pattern is –

Hence, option B is the correct answer.

Add the place value of each letter in the group, the sum is 31-

CWE = 3 + 23 + 5 = 31

FQH = 6 + 17 + 8 = 31

RDI = 18 + 4 + 9 = 31

MCO = 13 + 3 + 15 = 31

Hence, option B is the correct answer.

Pattern -

2 × 1 + 1 = 3

3 × 2 + 4 =10

10 × 3 + 9 = 39

39 × 4 + 16 = 172

Thus, in place of 38, it should be 39.

Hence, option C is the correct answer.

F + 3 = I => I + 3 = L => L + 3 = O => O + 3 = R

D + 3 = G => G + 3 = J => J + 3 = M => M + 3 = P

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

Hence, option D is the correct answer.

648 – 200 = 448

448 – 154 = 294

294 – 114 = 180

180 – 80 = 100

100 – 52 = 48

200 – 46 = 154

154 – 40 = 114

114 – 34 = 80

80 – 28 = 52

Hence, option B is the correct answer.

7 x 6 = 42

42 + 5 = 47

47 x 4 = 188

188 + 3 = 191

191 x 2 = 382

Hence, option B is the correct answer.