Question

# What is the HCF of two consecutive odd numbers?

As, we all know that odd numbers are written in the form of $2x \pm 1$.
So, the set of natural numbers is, $\left( N \right) = \left\{ {1,2,3,4,5,......} \right\}$.
And, out all-natural numbers some are odd numbers and they were $1,{\text{ }}3,{\text{ }}5,{\text{ }}7,......$