Respuesta :
ANSWER IS 1
explaination is that that the ony number tht 11 and 13 times table comes in
Answer:
1
Step-by-step explanation:
11 doesn't have any factors except for 1*11
13 doesn't have any factors except for 1*13
they both have a 1
therefore the greatest common factor of 11 and 13 is 1
Hope this helps! :D