Question

How many natural numbers not exceeding 4321 can be formed using the digits 1,2,3,4 without repetition?

Answer 1

As there are 4 digits 1, 2, 3, 4 and repetition of digits is allowed. ∴ Total number of natural numbers not exceeding 4321 = 4 + 16 + 64 + 229 = 313.

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