Question

How many five digit prime numbers can be obtained by using all the digits 1,2,3,4 and 5 without repetition of digits​

Answer 1

Answer:

Total numbers formed using 1, 2, 3, 4, and 5 without repetition is 5! = 120.

But the sum of digits (= 1 + 2 + 3 + 4 + 5 = 15) of any number formed is divisible by 3. It means all 120 numbers formed are divisible by 3.

Prime numbers are numbers which only divisible by 1 and itself.

So, the number of 5 digit prime numbers formed using the digits 1, 2, 3, 4, and 5 using repetition is 0.

Step-by-step explanation:

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Answer 2

if we add the numbers we get 15 which is divisible by 3 so there will be not any number which is prime and formed by these numbers