The H.C.F. of any two consecutive odd numbers is

$1$

The HCF of any two consecutive odd numbers is 1

1. Examples of Consecutive Odd Numbers:

• $3$ and $5$
• $7$ and $9$
• $11$ and $13$

2. H.C.F of Consecutive Odd Numbers:

• For $3$ and $5$, the H.C.F is $1$.
• For $7$ and $9$, the H.C.F is $1$.
• For $11$ and $13$, the H.C.F is $1$.

Key Point: The H.C.F of any two consecutive odd numbers is always 1 $1$, as they do not share any common factors other than $1$.$1$