Miscellaneous on Data Structures MCQ question and answer with solution

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23.
Which of the following ciphered text would have used transposition cipher for encryption of the plain text "DATASTRUCTURE"?

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25.
In the not recently used algorithm, which page is to be replaced when the new page comes in?

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26.
What is the space complexity of the following recursive implementation to find the factorial of a number?
int fact(int n)
{
     if(_________)
        return 1;
     return n * fact(n - 1);
}
int main()
{
      int n = 5;
      int ans = fact(n);
      printf("%d",ans);
      return 0;
}

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29.
What is the output of the following code?
#include<stdio.h>
int recursive_search_num(int *arr, int num, int idx, int len)
{
     if(idx == len)
     return -1;
     if(arr[idx] == num)
       return idx;
     return recursive_search_num(arr, num, idx+1, len);
}
int main()
{
      int arr[8] ={1,2,3,3,3,5,6,7},num=5,len = 8;
      int indx = recursive_search_num(arr,num,0,len);
      printf("Index of %d is %d",num,indx);
      return 0;
}

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30.
Which of the following is are two types of traditional cipher?

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