Answer:
The Greatest Common Factor (GCF) of 26 and 78 is 26.
Explanation:
The factors of 26 are 1,2,13,26
The factors of 78 are 1,2,3,6,13,26,39,78
So, as we can see, the Greatest Common Factor or Divisor is 26, because it is the greatest number that divides evenly into all of them.
Hope this helps! :)