Question

Find the GCD of $27,36$ and $80$ using step diagram.

• A. $2$
• B. $1$
• C. $3$
• D. $5$

Answer 1

The correct option is B $1$

Prime factorisation using step diagram for $27,36$ and $80$ are as follows:




$27=3\times 3\times 3\times 1$
$36=2\times 2\times 3\times 3\times 1$
$80=2\times 2\times 2\times 2\times 5\times 1$

As there is no common prime factors for all the three number, GCD is $1$.