Question

Qno. 1 : The number 199 is a three- digit number which remains prime number whichever way we arrange its digits. Find other such three- digit prime numbers having the same characteristics.​

Answer 1

Step-by-step explanation:

The best way for finding prime numbers is by factorisation method.

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Examples

Take a number, say, 26577.

The unit digit of this number is not 0, 2, 4, 6 or 8.

Now, take the sum of digits which will be: 2 + 6 + 5 + 7 + 7 = 27.

Since 27 is divisible by 3, 26577 is not a prime number.

Answer 2

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