how many four digit numbers can be formed such that the digits are in the decreasing order
Dharani Lakshmanan , 10 Years ago
Grade
Magical Mathematics[Interesting Approach]> how many four digit numbers can be formed...
1 AnswersShobhit Varshney
Last Activity: 10 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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