How many 3 digit even numbers can be formed without repetition from 1,2,3,4,5,6,7?
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Answer:
7 × 6 × 3 = 126
Detailed in below
100 th place 7 digits
10 th place 6 digits
(without repetition)
unit place 3 digits
(2,4,6 are only even from the given digits)
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