how many 3 digit num can be formed using the digits 1,2,3,4,5,6 without repeating any digit
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The total number of ways of selecting three digits is 5×4×3=60
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123
134
145
156
234
245
256
261
345
356
361
312
456
461
412
423
561
512
523
534
612
623
634
645
134
145
156
234
245
256
261
345
356
361
312
456
461
412
423
561
512
523
534
612
623
634
645
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