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

The sum of digits in the units 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`

A

432

B

108

C

36

D

18

Text Solution

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The correct Answer is:
B
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ML KHANNA-PERMUTATIONS AND COMBINATIONS -SET-3
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