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 :)