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In a telephone system four different let...

In a telephone system four different letter `P,R, S, T` and the four digits `3, 5, 7, 8` are used. Find the maximum number of "telephone numbers" the system can have if each consists of a letter followed by a four-digit number in which the digit may be repeated.

A

1024

B

2048

C

`4^(5)`

D

`5^(4)`

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The correct Answer is:
A
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