Question

How many 3-digits numbers can be formed using the digits 1,2,3.

a. no digit can be repeated.
b.if any digit can be used more than once
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Answer 1

6 numbers!!!

Explanation:

1. 123

2. 132

3. 213

4. 231

5. 321

6. 312

Answer 2

6 numbers

Explanation:

to understand this

you need to know about:

• factorial

given:

• total 3 numbers

let's solve:

according to the question

3!

1×2×3

6

therefore total 6 numbers can be formed using the digits

let's see the 6 numbers

123

132

213

231

312

321