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how many four digit numbers can be formed such that the digits are in the decreasing order

how many four digit numbers can be formed such that the digits are in the decreasing order

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1 Answers

Shobhit Varshney IIT Roorkee
askIITians Faculty 33 Points
7 years ago

Dear student,
Number of such numbers without having zero in the number = (9*8*7*6) / 4! = 126 Number of such numbers with having zero in the number = (9*8*7) / 3! = 84 Therefore, number of such numbers = (126+84) = 210 ….….….….….….….….….….….….….….….….….….….….….….….….….….…..

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