Question: Using the digits 1, 2, 3 and 4, how many numbers of at most 4 digits can be formed (repetition allowed)? (a) 340 (b) 256

Using the digits 1, 2, 3 and 4, how many numbers of at most 4 digits can be formed

(repetition allowed)?

(a) 340

(b) 256

(c) 64

(d) None of these.

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