Copyright © University of Cambridge. All rights reserved.

See all short problems arranged by curriculum topic in the short problems collection

Which of the following numbers is the product of exactly $3$ distinct prime numbers?

$45$, $60$, $91$, $105$, $330$

If you liked this problem, here is an NRICH task which challenges you to use similar mathematical ideas.

*This problem is taken from the UKMT Mathematical Challenges.*