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The sum of the digits in the unit place ...

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

Text Solution

Verified by Experts

Number 3 can be placed 18 times
Number 4 can be placed 24 times
Number 5 can be placed 30 times
Number 6 can be placed 36 times
Total patterns=108
Option 3 is correct.
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