A 6-digit code consists of two number digit chosen from 0, 1, 2, 3 and four letters chosen from p, q, r, s, t. If the first and last digit must be a number digit and each digit can appear more than once in a code, how many different codes are possible?
(A) 375
(B) 625
(C) 1,875
(D) 5000
(E) 10,000
Answer is E
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