Which of the following numbers is perfectly divisible by ?
- A
- B
- C
- D
Solution & Step-by-step Explanation
A number is divisible by if the difference between the sum of its digits at odd positions and the sum of its digits at even positions is either or a multiple of .Let's test Option B: Sum of digits at odd positions (from right to left: ):
Sum of digits at even positions ():
Difference = Since the difference is , is perfectly divisible by .
Sum of digits at even positions ():
Difference = Since the difference is , is perfectly divisible by .