Question
Tue November 20, 2012 By: Ekta Choudhary

by using digits from 1 to 9 how many 3 digits numbers can be made which can be arranged in ascending order?

Expert Reply
Tue November 20, 2012

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.
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