Title Notes_Coding Decoding_Coding Decoding.pdf ✅

www.thinkiit.in Page 1 thinkIIT CODING-DECODING The term Coding-Decoding primarily relates with message sent in secret form which can not be understood by others easily. Coding, therefore, means rule or method used to hide the actual meaning of a word or group of words and decoding means the method of making out the actual message that is disguised in coding. Category I In this category of questions, a word is coded by simplychanging the order of letters of the word.  EXAMPLES  Ex.1 In a code language if TRAINS is coded as RTIASN, how PISTOL will be coded in the same language ? (A) SITLOP (B) IPSTLO (C) SIPTLO (D) IPTSLO Sol. If we compare the basic word {TRAINS} with the coded word {RTIASN}, we would see that the letters used in the word are same as in the basic word but their order of placement has been changed. Letter T at first position of basic word has been placed at second position in the coded word & letter R at second position has been placed in the first position. It means that in this question, letters of the basic word have been interchanged i.e., first letter with second, third with the fourth and so on. And thus we get the coded word. In this code language word, PISTOL will be coded as IPTSLO. Hence, option (D) is our answer. Category II In this category of questions, letters of a word are substituted for either a new letter or a numeric. And the same substitution helps to find out the coding of the word in questions. This substitution of letters may either be direct or in a jumbled up fashion. (A) Direct Substitution Ex.2 In a code language if SUGAR is coded as PKLTN and TEA is coded as QGT, how would you code GREAT in the same code language ? (A) ENGTP (B) LNGTK (C) LNGTQ (D) LNGQT Sol. SUGAR PKLTN Basic Word Coded Word TEA QGT Basic Word Coded Word