Question 21.
An encryption system operates as follows:
Step 1. Fix a number k .
Step 2. For each word, swap the first k letters from the front with the last k letters from the end in reverse order. If a word contains less than 2k letters, write the entire word in reverse order.
Step 3. Replace each letter by a letter k spaces ahead in the alphabet. If you cross Z in the process to move k steps ahead, start again from A.
Example: k = 2: zebra --> arbez --> ctdgb.
If the word “flight” becomes “znmorl” after encryption, then the value of k:
Step 1. Fix a number k .
Step 2. For each word, swap the first k letters from the front with the last k letters from the end in reverse order. If a word contains less than 2k letters, write the entire word in reverse order.
Step 3. Replace each letter by a letter k spaces ahead in the alphabet. If you cross Z in the process to move k steps ahead, start again from A.
Example: k = 2: zebra --> arbez --> ctdgb.
If the word “flight” becomes “znmorl” after encryption, then the value of k:
A
5
B
4
C
7
D
Cannot be determined uniquely from the given information
Question Explanation
Text ExplanationVideo Explanation
Flight become znmorl
Let's assume k>3
So flight will become thgilf -> znmrol. Hence the value of k will be 6
Let's assume k>3
So flight will become thgilf -> znmrol. Hence the value of k will be 6
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