2018 · Q41
All odd prime numbers upto 110 are multiplied together. What is the unit digit in this product?
Elementary MathematicsNumber System
- A0
- B3
- C5
- DNone of the above
Explanation
The product of all odd primes up to 110 includes 5, and every other factor is odd. A product of odd numbers containing a factor 5 ends in 5, option (C).