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How many three-digit numbers can be formed from digits 1–9 without repetition?
A504
B729
C648
D720
Answer & Solution
Correct answer: A. 504
1. Hundreds: 9 choices; tens: 8 remaining; units: 7 remaining.
2. Total = 9 × 8 × 7.
3. = 504.
_Source: KMAT Karnataka 2022 PYQ Q.74_