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

The sum of digits in the unit's place of all numbers formed with the help of 3, 4, 5, 6 taken all at a time is a. `18` b. `432` c. `108` d. `144`

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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

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Statement-1: the sum of the diigits in the ten's place of all numbers formed with the help of 3,4,5,6 taken all at a time is 108. Statement-2: The sum of the digits in the ten's place= The sum of the digits is the units's place.

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