(Solved): 4. Write a function that takes as input a positive value \( i \) and which returns True if \( i \) ...

4. Write a function that takes as input a positive value \( i \) and which returns True if \( i \) is divisible by either 3 or 5 (or both). 5. Write a function that takes as input a positive value \( n \) ans which determines how many of the numbers \( 1,2,3,4, \ldots, \mathrm{n} \) are divisible by neither 3 nor 5 . (So how many are not divisible by 3 and not divisible by 5.) This function must call your function from the previous question. What does your program determine when \( \mathrm{n}=100 ? \mathrm{n}=1000 \) ? 6. Write a function called isSubstring that takes as input a string \( S \) and a string \( x \) of length exactly 2. Your function should return True if string \( S \) contains \( x \) as a substring, and False otherwise. For example: - isSubstring( "abcdef", "cd" ) should return True - isSubstring( "abcdef", "ef") should return True - isSubstring( "abcdefghijk", "gi" ) should return False