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The ten's digit of 1!+2!+3!+ . . .+97! i...

The ten's digit of `1!+2!+3!+ . . .+97!` is

Text Solution

Verified by Experts

The correct Answer is:
1
For `n ge 10`, the number of zeros in `n! ge2`
`therefore1!+2!+31+4!+ . . .+97!= . . 13`
`therefore`Ten's digit=1
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Knowledge Check

  • The tens digit of the 2^(248) is :

    A
    1
    B
    7
    C
    5
    D
    none of these

  • The tens digit of the 2^(248) is:

    A
    1
    B
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    C
    5
    D
    none of these

  • The ten's digit of a three digit number is 3. If the hundredth and unit digits are interchanged and the number thus formd is 396 more than the previous one. The sum of unit digit and hundred difit is 14, then what is the number ?

    A
    480
    B
    539
    C
    593
    D
    935

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