Question

Which of the following is false?
a. H.C.F. (p,q,r) * L.C.M.(p,q,r) = pxqxr
b. H.C.F.(p,q,r) = 1; if p, q, r are prime numbers
c. H.C.F.(a,b) x L.C.M. (a,b) = a × b
d. L.C.M. (p,q,r) = p x q x r; if p, q, r are prime numbers​

Answer 1

Option A is incorrect.

Step-by-step explanation:

It is not correct that the product of HCF & LCM of three numbers is equal to product of the three numbers. This formula is valid only for two numbers.

Thus if two numbers are a &b, then

HCF of ( a,b ) × LCM of  ( a,b ) = a × b

But the above equation is not valid for three numbers.

Therefore Option A is false & other three options are correct for the given three numbers.

Answer 2

Answer:

option (A) is incorrect