CBSE Class 11-science Answered
by using digits from 1 to 9 how many 3 digits numbers can be made which can be arranged in ascending order?
Asked by ekta choudhary | 20 Nov, 2012, 04:48: PM
Expert Answer
No. of ways of selecting three numbers out of digits from 1 to 9 =9C3=9*7*8/6=84,for ascending order numbers should be distinct.
Now to form three digit no. in ascending order any three selected numbers will be arranged in only 1 way. So here using digits from 1 to 9, 84 three digits numbers can be made which can be arranged in ascending order.
Answered by | 20 Nov, 2012, 10:13: PM
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