A probability problem by anantam mudgal
Probability
Level
3
The number of seven digit integers, with sum of the digits equal to 10 and formed by using the digits 1, 2 and 3 only, is
88
55
77
66
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1 solution
The 7 digit number are made by rearranging (1,1,1,1,1,2,3) and (1,1,1,1,2,2,2). So 77 such numbers are possible.