Question
Which one of the following numbers is divisible by 11?
Solution
The given number can only be completely divided by 11 if the difference between the sum of digits at the odd position and the sum of digits at the even position in a number is 0 or 11. 1987645 1+8+6+5=20 9+7+4=20 =20-20=0.
Which of the following is essential for nursery record-keeping?
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