### Code:

def rem(a, b):

return a % b

print(rem(3,7))

### Solution and Explanation:

Let's break down the code step by step:

def rem(a, b):: This line defines a function named rem that takes two parameters a and b. Inside the function, it calculates the remainder of a divided by b using the modulus operator %.

return a % b: This line calculates the remainder of a divided by b using the modulus operator % and returns the result.

print(rem(3, 7)): This line calls the rem function with arguments 3 and 7 and prints the result.

a is 3.

b is 7.

So, rem(3, 7) calculates the remainder of 3 divided by 7, which is 3.

So, when you run this code, it will print 3.

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