How many six digit numbers

How many six digit numbers can be formed in decimal system in which every succeeding digit is greater than previous digit ?
Ans:⁹C₃

2 Answers

Doesen't every set of 6 digits satisfy this?

The answer is indeed 9C6
the logic is simple

just chose any three numbes,

the smallest digit first, ,then the second then the third...

you will get a unique number :)

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