Answer:
Step-by-step explanation:
let it 3 root 2 /5 be a rational no.
then 3 root 2/5=p/Q
3 root 2=5p/Q
root 2=5p/3q
LHS is an irrational no.
LHS NOT=RHS
this contradiction is due to our wrong assumption that 3 root 2/5is a rational no.
therefore 3 root 2/5is an irrational no.
