How many numbers not exceeding
1000 can be made from the digits 1, 2, 3, 4, 5, 6, 7, 8, 9 if repetition is not
allowed.
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2
Answer= 819
Step-by-step explanation:
1,2,3,4,5,6,7,8,9
One digit number can be formed =9
Two digit number can be formed =9 × 9=81
Three digit number can be formed =9 × 9 × 9=729
Total =9+81+729=819
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