1. Given a graph, write a function to perform a Breadth-First Search (BFS) traversal starting from a given source node.
2. What command can you use to check free memory space?
3. Write a program to find the sum of prime numbers present as digits in a given long integer.
4. How would you improve revenue for Swiggy by 25%?
5. How do you convince a customer who is hesitant to purchase goods and services?
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