Respuesta :
I believe its subtracting by 9 so the answer would be 51, 42, 33.
Answer:
51, 42, 33
Step-by-step explanation:
87, 78, 69, 60, 51, 42 , 33
They all are differences of 9, so just subtract 9 to the the pattern
If this help mark me as Brainliest :)