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 :
Option: 1
Option: 2
Option: 3
Option: 4
First possiblity is 1, 1, 1, 1, 1, 2, 3
Second possiblity is 1, 1, 1, 1, 2, 2, 2
Total = 42 + 35 = 77
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