A) 90,000
B) 100,000
C) 30,240
D) 69,760
Correct Answer: D
Solution :
Using the digits 0, 1, 2, ......, 9 the number of five digit telephone numbers which can be formed is \[{{10}^{5}}\] (since repetition is allowed) The number of five digit telephone, numbers which have none of the digits repeated = \[^{10}{{P}_{5}}=30240\]. \[\therefore \]The required number of telephone numbers = \[5\times 4=20\].
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