Answer:
2 x 3 = 6
Explanation:
Factors of 6 = 2 x 3
Factors of 72 = 2 x 2 x 2 x 3 x 3
Factors of 120 = 2 x 2 x 2 x 3 x 5
This means that the H.C.F of 6,72 and 120 is 2 x 3 = 6\
Addition : Find 2 numbers that all 3 numbers have and multiply them. That will be your answer.