3. Write a program in C which takes input of n numbers from the user. Print out the odd numbers, their sum and average using while loop. 4. Write a C program (using any suitable loop) to check if the number entered by the user is a prime number or not (Prime numbers are divisible only by the number 7 or itself. For example, 2, 3, 5, 7 and 14 are the first few prime numbers./