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Grade: 11
        
No of six digit number that can be formed, having the property that every succeeding digit is greater than the preceding digit, is equal to?
 
8 months ago

Answers : (2)

Saurabh Koranglekar
askIITians Faculty
1857 Points
							
the first digit can be selected in 9 ways
next in 8 ways and so on
therefore total ways = 9*8*7*6*5*4
8 months ago
Arun
20299 Points
							
Once you pick six different digits, there is only one way to arrange them so that the digits are increasing. I would view the answer as 9C6, but of course this is equal to 9C3 

nCr = nC(n-r) 
9C6 = 9C3 = 84 
8 months ago
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