COMPUTER SCIENCE AND ENGINEERING
SQL
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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343
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464
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565
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666
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Detailed explanation-1: -Explanation: The first digit of the 3-digits can take 7 distinct values: 1, 2, 3, 4, 5, 7, 9. As repetition is allowed, the second digit can also take 7 distinct values, and the third can take 7 distinct values aswell, giving a total of 7⋅7⋅7=343 distinct combinations of numbers.
Detailed explanation-2: -∴ Total number of 3-digit numbers = 3×4×5=60.
Detailed explanation-3: -Therefore 120 such numbers are possible.
Detailed explanation-4: -There are 9 digits available to form 3-digits numbers without repetition. There are 9 choices for the hundreds digit, 8 choices for the tens digit, and 7 choices for the units digit. Therefore, 9 * 8 * 7 = 504 such 3-digits are possible.
Detailed explanation-5: -ANSWER: 120 three-digit numbers can be formed WITHOUT REPETITION OF DIGITS.