GATE CE 2015 Set 2 — Question 8
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General Aptitude → Quantitative Aptitude → Permutations & Combinations
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Question
How many four digit numbers can be formed with the 10 digits 0, 1, 2, ..., 9 if no number can start with 0 and if repetitions are not allowed?
Correct answer
4536 to 4536
Solution
To form a 4-digit number using digits without repetition:
1.The first digit cannot be 0. So, there are 9 choices (1-9).
2.The second digit can be any of the remaining 9 digits (including 0).
3.The third digit can be any of the remaining 8 digits.
4.The fourth digit can be any of the remaining 7 digits.
Total numbers = .Continue learning with Success Tracker
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