4 Maths -- Permutation and Combination

How many numbers are there between 100 and 1000 , which have exactly one of their digits as 7 ?

How many numbers are there between 100 and 1000 , which have exactly one of their digits as 7 ?

1 Answers

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( 6C4 * 8C3 ) - (5C3 * 7C2) = 630
Answer: Non of the above

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