In how many ways can a three-digit number be formed from the set of digits
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A phrase ' from left to right' suggests that you want numbers like 543.
Given a set of 3 digits, we can arrange it in a descending order in only one way.
So, the problem jumps down to the ways of selection of 3 digits from 0 to 9.
0 can never be a hundreds digit as it's the smallest digit.
So, number of required numbers
= 10C3 = 120.
Given a set of 3 digits, we can arrange it in a descending order in only one way.
So, the problem jumps down to the ways of selection of 3 digits from 0 to 9.
0 can never be a hundreds digit as it's the smallest digit.
So, number of required numbers
= 10C3 = 120.
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