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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. 1024B. 2048C. `4^(5)`D. `5^(4)` |
| Answer» Correct Answer - A | |