Question

How many prime numbers are there in the list 1, 12, 123, 1234, 12 345, 123 456 ?​

Answer 1

Answer:

Aside from 1 itself, all other numbers listed can be easily recognized as not being prime. Firstly, 12, 1234, and 123456 are all even numbers, and so each of them also has 2 as a factor. Secondly, 12, 123, 12345, and 123456 are each divisible by 3, so that is an additional factor for them. Lastly, 12345 is divisible as well by 5.

Hope it helps you

Answer 2

Answer:

Answer refers to the attachment ..