# NPTEL The Joy of Computing using Python Week 6 Assignment Answers 2024

By Sanket

## NPTEL The Joy of Computing using Python Week 6 Assignment Answers 2024

1. If n is a positive integer, what is the output of the function given input n,

• Sum of numbers from 1 to n
• Sum of numbers from 1 to n-1
• n-1
• n
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2. Which of the following are true about recursion?

• Recursion is a process in which a function calls itself as a subroutine.
• Recursion is a better alternative for performing repetitive tasks compared to iteration.
• Recursion requires more resources compared to iteration.
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3. What is the output of following code ?

• 10
• 8
• 5
• Error
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4. The letter ‘e’ is the most frequently occurring letter in the English language. Suppose we apply a Substitution Cipher where ‘e’ is mapped to ‘a’, and all other letters are uniquely mapped to different letters. If we encrypt a very long English storybook using this cipher, will the frequency of ‘a’ be the highest in the encrypted text?

• Yes, it would be same as ’e’ in the original text
• Yes, it would be higher than ’e’ in the original text.
• No, it would be lower than ’e’ in the original text.
• No, we cannot predict
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5. Could we check frequency of letters in a long ciphertext and map them to frequency of letters in English to decrypt the message?

• Yes, it is possible.
• No, it is not possible.
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6. What are drawbacks of using frequency analysis to decrypt a message that has been encrypted using Substitution Cipher?

• It will not work if the cipher text is too small.
• It works flawlessly.
• It will not work if the encrypted text was previously encrypted using a different cipher, which could have removed patterns in common English.
• The frequency analysis method doesn’t work at all for Substitution Cipher
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7. If variable dict name is a non-empty dictionary, what does dict name.keys() return?

• Returns nothing, but prints all the keys in the dictionary.
• Returns a list of all the keys in the dictionary.
• Returns a list of all the values in the dictionary.
• Returns a list of all the items in the dictionary
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8. Is Ceaser Cipher a type of Substitution Cipher?

• Yes
• No
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9. What is the consequence of not having a base case in a recursive function?

• The function will run infinitely.
• The function will run only once.
• The function will not run at all.
• The function will run only for a fixed number of times.
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10. What are the number of possible final lines when someone wins, in a game of TicTac-Toe?

• 3
• 8
• 9
• 4
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