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Question

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
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B
108
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C
432
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D
144
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Solution

The correct option is B 108
When 3 is in the unit place, then the number of numbers =3!=6
Thus, sum of digits in the unit's place =3×6=18
Similarly, 4×6,5×6,6×6
Hence, sum of digits in unit place =18+24+30+36=108

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