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The sum of the digits at the 10th place ...

The sum of the digits at the 10th place of all numbers formed with the help of 2,4,5,7 taken all at a time is

A

432

B

108

C

36

D

18

Text Solution

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The correct Answer is:
A
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Knowledge Check

  • The sum of the digits at the 10^(th) place of all numbers formed with the help of 2,4,5, 7 taken all at a time is

    A
    432
    B
    108
    C
    36
    D
    18

  • The sum of the digits in the unit's place of all the 4-digit numbers formed by 3,4,5 and 6, without repetition , is

    A
    432
    B
    108
    C
    36
    D
    72

  • The sum of all 4 digit numbers of different digits formed with the digits 1, 2, 5 and 6 is

    A
    93324
    B
    90334
    C
    93234
    D
    90234

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