Answer:
it is 2 bcz if we see that in the 12 , 18 and 56 the two is the highest common factor
2 to the power of six times 3 cubed times seven.
Step-by-step explanation:
The prime factors of 56 are 2 cubed times 7 and the prime factors of 18 are 2 times 3 squared The prime factors of 12 are 2 squared times 3.
