Question

S2. I can be expressed as the product of two different prime numbers. My last digit is 0. In my
prime factorisation, no number is repeated more than two times. I am less than 120.
Who am I?​

Answer 1

Answer:

Except for 2 and 5, all prime numbers end in the digit 1, 3, 7 or 9. In the 1800s, it was proven that these possible last digits are equally frequent.