JEE MATHEMATICS MCQ: PERMUTATIONS

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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

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Correct option: C

Option C (77) is correct because the total number of integers is the sum of the possibilities from two cases: five 1's, one 2, one 3 and four 1's, three 2's.

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