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• How many 5-digit numbers are divisible by 11 and have the sum of its digits equal to 43?

• There is a 10-digit number consists of the digits 0 to 9 each once. The leading digit is 8, the number formed by the first two digits is divisible by 3, the number formed by the first three digits is divisible by 4, and this pattern continue, the last condition is the first 9 digits is divisible by 10. Find this 10-digit number.

 Apr 26, 2021

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