Q3. Write a C program that calculates and returns/prints the factorial of an integer. The integer value should be accepted as input from the user. You only need to accept an input value less than 20. You may choose to add a check for this at input and then calculate factorial only if it satisfies this condition, else print it does not satisfy the condition and exit.

Q4. Write a C program that calculates geometric and harmonic means of a group of integers. The program must ask user how many integer numbers/ count. Then the program must accept those many integers from the user.. Then the program must calculate and return/display the geometric and harmonic means of all the values. Hint- You will need to retain the count of the numbers input till 999 is input. Geometric mean of n numbers = (Product of all numbers)^(1/n) Harmonic mean of all numbers = n / (sum of reciprocals of all numbers)