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7. Permutations and Combinations
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Q29 of 64 Page 122

The sum of the digits in unit place of all the numbers formed with the help of 3, 4, 5 and 6 taken all at a time is

The sum of the digits in unit place of all the numbers formed with the help of 3, 4, 5 and 6 taken all at a time is


=(3+4+5+6)3!


=108

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Questions · 64
7. Permutations and Combinations
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