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NCERT Class XI Mathematics - Permutations and Combinations - Solutions

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Question : 11 of 41
Marks: +1, -0
How many 3-digit numbers can be formed by using the digits 1 to 9 if no digit is repeated?
Solution:  
Total digits are 9. We have to form 3 digit numbers without repetition.
∴ The required 3 digit numbers =  9P3\,{}^9P_3 = 9 × 8 × 7 = 504
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