Coding and Decoding is the method used for transmitting a message from sender to receiver that no third party can understand it. Coding and Decoding can be done in two ways:
(1) Letter Coding
(2) Number Coding
Some Important methods used in Letter Coding
Method 1: Moving a letter forward
If the word NELLORE is coded as OFMMPSF, then coded word for HYDERABAD is
Explanation: Each letter is moved one step forward in the word-NELLORE, you can obtain the corresponding word- OFMMPSF as N -> O,E ->F,L -> M,L -> M,O->P,R->S and E->F. Similarly, HYDERABAD can be coded as IZEFSBCBE.
Method 2: Moving a letter backward
If the word CHAIR is coded as BGZHQ, then coded word for BENCH is
Explanation: Each letter is moved one step backward in the word- CHAIR, you can obtain the corresponding word- BGZHQ as B -> A, E -> D,N -> M,C -> B and H ->G. Similarly,
BENCH can be coded as ADMBG
Method 3: Reversing the word
If the word MADAM is coded as MADAM, then coded word for LEVEL is
Explanation: Reverse order for MADAM is MADAM. Similarly for LEVEL, it is LEVEL.
Method 4: Reversing the word and moving one step forward
If the word INTERNET is coded as UFOSFUOJ, then coded word for MODEM is
Explanation: Given word INTERNET should be written in reverse order first i.e. TENRETNI and then each letter should be moved one step forward i.e. T->U, E->F . . . .N->O and I->J and finally it becomes as UFOSFUOJ. Similarly MODEM first appears as MEDOM and then becomes as NFEPN.
Method 5: Reversing the word and moving one step backward
If the word PERMUTATIONS is coded as RMNHSZSTLQDO, then coded word for COMBINATIONS is
Explanation: Given word PERMUTATIONS should be written in reverse order first i.e. SNOITATUMREP and then each letter should be moved one step backward i.e. S->R, N->M. . . .E->D and P->O and finally it becomes as RMNHSZSTLQDO. Similarly COMBINATIONS first appears as SNOITANIBMOC and then becomes as RMNHSZMHALNB.
Method 6: Reversing all letters except first and last
If the word PROCESSOR is coded as POSSECORR, then coded word for KEYBOARD is
Explanation: In the given word, first and last letters will remain same and remaining letters are written in reverse order. Then PROCESSOR -> POSSECORR. Then KEYBOARD becomes KRAOBYED
Method 7: Moving odd letters a step forward, without any change in even letters
If the word POTATO is coded as QOUAUO, then coded word for BRINJAL is
Explanation: In the given word POTATO, odd letters are moved a step forward while the even letters remains same i.e. P->Q,T->U and T->U, the new word becomes as QOUAUO. Similarly BRINJAL becomes as CRJNKAM
Method 8: Moving even letters a step forward, without any change in odd letters
If the word CHEMICAL is coded as CIENIDAM, then coded word for MEDICAL is
Explanation: In the given word CHEMICAL, even letters are moved a step forward while the odd letters remains same i.e. H->I,M->N, C->D and L->M, the new word becomes as CIENIDAM. Similarly MEDICAL becomes as MFDJCBL.
Method 9: Moving even letters a step forward and odd numbers a step backward
If the word QUESTION is coded as PVDTSJNO, then coded word for ANSWER is
Explanation: In the given word QUESTION, if even letters are moved one step forward (U->V, S->T, I->J and N->O) and odd letters moved one step backward (Q->P, E->D, T->S and O>N), then the word QUESTION becomes as PVDTSJNO. Similarly, ANSWER becomes as ZORXDS.
Method 10: Moving odd letters a step forward and even numbers a step backward
If the word PENCIL is coded as QDOBJK, then coded word for ERASER is
Explanation: In the given word PENCIL, if odd letters are moved one step forward (P->Q, N->O and I->J) and even letters moved one step backward (E->D, C->B and L>K),then the word PENCIL becomes as QDOBJK. Similarly, ERASER becomes as FQBRFQ.
1. If Rose is coded as 6821, Chair is coded as 73456, preach is coded as 961473 and then code for SEARCH is
Explanation: compare the code of each letter in all the above words given, and then form code for SEARCH i.e. let us take letter E, its code is 1 in both Rose (6821) and Preach (961473)
S -> 2
E -> 1
A -> 4
R -> 6
C -> 7
H -> 3
2. If exam is coded as 5234 and sample is coded as 134675 and then code for EXAMPLE is
Explanation: From the given two words exam (5234) and sample (134675), we can code EXAMPLE as 5234675
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