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Question: The last three digits of a telephone number beginning with 135 \_ \_ \_ have been erased. The probab...

The last three digits of a telephone number beginning with 135 _ _ _ have been erased. The probability that the erased digits will be all identical is -

A

150\frac { 1 } { 50 }

B

1100\frac { 1 } { 100 }

C

3100\frac { 3 } { 100 }

D

None

Answer

1100\frac { 1 } { 100 }

Explanation

Solution

T.C. = ××× = 10.10.10

F.C.= {000,111,...,999} = 10

P = 1100\frac { 1 } { 100 }