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The number of three-digit numbers having...

The number of three-digit numbers having only two consecutive digits identical is

A

171

B

170

C

90

D

180

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The correct Answer is:
A
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Knowledge Check

  • The number of 5-digit numbers in which no two consecutive digits are identical, is

    A
    `9^(2)xx8^(3)`
    B
    `9xx8^(4)`
    C
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    D
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    A
    171
    B
    170
    C
    90
    D
    180

  • The first two digits of all six digits telephone numbers are from the set of then the number of telephone numbers having all the six digits distinct is

    A
    7200
    B
    8400
    C
    9200
    D
    none of these

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