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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

A

18

B

432

C

108

D

144

Text Solution

Verified by Experts

The correct Answer is:
C
Required sum is `3!(3+4+5+6)=6xx16xx18=108`
[ if we fix 3 in the unit place, other three digits can be arranged in 3! Ways similarly for 4,5,6]
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