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Stamenkovica02

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Three three-digit numbers are formed from the digits 1,2 ... 9 (each digit is used exactly once). Which of the given numbers cannot be equal to the sum of these three numbers?
1500,1503,1512,1521,1575?
 
Stamenkovica02 said:
Three three-digit numbers are formed from the digits 1,2 ... 9 (each digit is used exactly once). Which of the given numbers cannot be equal to the sum of these three numbers?
1500,1503,1512,1521,1575?
Click to expand...
Please show us what you have tried and exactly where you are stuck.

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Stamenkovica02 said:
Three three-digit numbers are formed from the digits 1,2 ... 9 (each digit is used exactly once). Which of the given numbers cannot be equal to the sum of these three numbers?
1500,1503,1512,1521,1575?
Click to expand...
Have you learned either about casting out nines, or about modulo 9?
 
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