Question

Four-digit numerical codes are issued for an ATM. If no integer can be repeated in a code, how many different codes can be formed using only odd integers?

Answer 1

Answer:

The answer is "120".

Step-by-step explanation:

The assuming numbers:

$0, 1,2,3,4,5,6,7,8,9$

The  odd number are=$1,3,5,7,9$

Now we have four places:

In the first place we have 5 option

In second place we have 4 option

In third place, we have 3 option

In fourth place, we have 2 option

So, the value is $5 \times 4 \times 3\times 2 \times 1= 120$

So, we have 120 different codes, which form the code.