Which of the following is a necessary condition for a number to be divisible by

Which of the following is a necessary condition for a number to be divisible by 7?

Which of the following is a necessary condition for a number to be divisible by 7?

Step 1: Take the number you want to check for divisibility by 7.
Step 2: Look at the last digit of that number.
Step 3: Double the last digit you found in Step 2.
Step 4: Subtract the result from Step 3 from the rest of the number (the number without the last digit).
Step 5: Check if the result from Step 4 is divisible by 7. You can do this by dividing it by 7 and seeing if there is a remainder.
Step 6: If the result from Step 4 is divisible by 7, then the original number is also divisible by 7.

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