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For each number, there are four digits, and for each digit, there are two possibilities for digits: 3 or 4. So the number of 4-digit numbers is 2*2*2*2 = 16. The 4-digit numbers using 3 and 4 are:

3333

3334

3343

3344

3433

3434

3443

3444

4333

4334

4343

4344

4433

4434

4443

4444

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Q: How many 4-digit numbers can you write using 3 and 4?
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