Solving Coding-Decoding Problems

This question involves a coding-decoding pattern where words are transformed into other words based on a specific rule applied to each letter. We are given two examples to decipher this rule.

Analyzing the First Example: DOUBT to CPTCS

Let's look at the transformation of each letter from DOUBT to CPTCS:

• D changes to C: C is one letter before D in the alphabet. This is a shift of $-1$.
• O changes to P: P is one letter after O in the alphabet. This is a shift of $+1$.
• U changes to T: T is one letter before U in the alphabet. This is a shift of $-1$.
• B changes to C: C is one letter after B in the alphabet. This is a shift of $+1$.
• T changes to S: S is one letter before T in the alphabet. This is a shift of $-1$.

So, the pattern for DOUBT to CPTCS is a sequence of shifts: $-1, +1, -1, +1, -1$.

Analyzing the Second Example: OTHER to NUGFQ

Let's check if the same pattern applies to the second example, OTHER to NUGFQ:

• O changes to N: N is one letter before O ($ -1 $).
• T changes to U: U is one letter after T ($ +1 $).
• H changes to G: G is one letter before H ($ -1 $).
• E changes to F: F is one letter after E ($ +1 $).
• R changes to Q: Q is one letter before R ($ -1 $).

Yes, the pattern $-1, +1, -1, +1, -1$ is consistent for OTHER to NUGFQ as well.

Applying the Pattern to SHOUT

Now that we've identified the rule as alternating shifts of $-1$ and $+1$ starting with $-1$, we apply it to the word SHOUT:

• S: Apply $-1$ shift. S − 1 = R.
• H: Apply $+1$ shift. H + 1 = I.
• O: Apply $-1$ shift. O − 1 = N.
• U: Apply $+1$ shift. U + 1 = V.
• T: Apply $-1$ shift. T − 1 = S.

Following the $-1, +1, -1, +1, -1$ pattern, SHOUT is coded as RINVS.

Conclusion

Based on the consistent pattern found in the given examples, the word SHOUT is coded as RINVS. We check the options to find the word RINVS.

The coded word for SHOUT is RINVS, which corresponds to one of the given options.

Revision Table: Coding-Decoding Pattern

Additional Information: Types of Coding-Decoding

Coding-decoding questions are common in competitive exams. They test your ability to identify patterns in letters, numbers, or symbols. Here are some common types:

• Letter Coding: Letters are replaced by other letters based on a specific rule (like shifts, positional values, reversal). This question is an example of letter coding.
• Number/Symbol Coding: Words are coded into numbers or symbols.
• Mixed Coding: Words, numbers, or symbols are used in a mix.
• Substitution Coding: A specific word is substituted for another word (e.g., 'red' is called 'blue').
• Chinese Coding: Sentences are given with coded words, and you find the code for a specific word by comparing sentences.

Practicing different types helps you quickly identify the pattern in coding-decoding problems.