Question

3. The L.C.M of 78, 39 is 78. Find their H.C.F.​

Answer 1

Answer:

2[78,39,78]

13[ 39, 39,39]

3 [3,3,3]

[1,1,1]

2×13×3

26×3

78

so the lcm of 78,39, 78=78

Answer 2

Answer:

The HCF will be 39.

Step-by-step explanation:

Given: The L.C.M of 78, 39 is 78.

We have to find their HCF.

• As we know that the product of the HCF and LCM of two numbers is equal to the product of the two numbers.
• By using the above concept, we are finding the value of HCF.

We are solving in the following way:

We have,

The L.C.M of 78, 39 is 78.

So,

$=>HCF\times LCM=78\times39\\\\=>HCF \times 78=3042\\\\=>HCF=\frac{3042}{78} \\\\=>HCF=39$

Therefore, the HCF is 39.