Answer:
The function is provided below.
Step-by-step explanation:
Running the program in Python, the code for this problem is as follows:
def func(n):
    count = 0                      **initializing the sum with 0**
    for i in range (1, n):
          if i%3 == 0 or i%5 == 0:    Â
               count = count + 1
   return (count)
When the program is executed enter value 1 to 10 one by one and the result will be 23, the sum of all the multiples of 3 and 5.