TS Police SI Mains 2018 Arithmetic and Reasoning

Number the alphabets as A = 1, B = 2, C = 3 and so on
Then the number standing for each alphabet is squared and every alphabet is replaced with this respective square in the given coding system
Hence, A = 1, G = 7 squared = 49, R = 18 squared = 324 and so on

BHADRA becomes 4 64 1 16 324 1  

From the first code, we can deduce that B = 2, A = 7, L = 4 and from second we can deduce that N = 0 and G = 8
Hence, BANGLA = 270847

Every alphabet's code is given by:
Numeric code = 1 +(n-1)*2 where n = chronological position of alphabet in the 26-alphabet system

G is 7th alphabet
Hence, its numeric code = 1 + 12 = 13

PRASAD 123435
A --> 3, D --> 5, P--> 1, R--> 2, S --> 4

Use the code to generate for other words given and we get 
SARADA --> 432353

DASARA --> 534323 and so on. 

The standard conversion to mathematical expression would be:
[(39/13)*6] + 8 = 18 + 8 = 26

We can see that the given reason works perfectly for the word and code given in the question.
Applying the same to FRANCE also gives the same answer as given.
Hence, both are correct and II is the right reason too. 

Number every alphabet as A = 1, B = 2, C = 3 and so on
Every alphabet's code thus becomes: (26 - Number of the alphabet)th alphabet 
Thus B bcomes coded as (26-2) = 24th alphabet = X

Now, F => 26-6 = 20th alphabet = T
        L => 26-12 = 14th alphabet = N and so on

Thus, FLUTE = TNEFU

Every alphabet gets replaced with its +2 alphabet
Hence, CURSE becomes EWTUG

M --> N
A --> U
N --> (O) --> P
G -- > H 
O --> I 

The code is CDEFG

Vowel I gets coded as E
B gets written as C, C as D, D as F, F as G.
Hence, original word was BCIDF