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QJEEM21Ma065d: JEE Main 2021 Mathematics - Class 11 JEEM21Ma065d Solution: The number of seven digit integers with sum of the digits equal …
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 :
Multiple Choice Options
- A 35
- B 42
- C 82
- D 77
Step-by-Step Verified Solution
(I) First possibility is 1, 1, 1, 1, 1, 2, 3
required number = = 7 6 = 42
(II) Second possibility is 1, 1, 1, 1, 2, 2, 2
required number =
Total = 42 + 35 = 77
required number = = 7 6 = 42
(II) Second possibility is 1, 1, 1, 1, 2, 2, 2
required number =
Total = 42 + 35 = 77