Asked by Itz

What is the sequence of 3 21 39 57 need help is so hard it says to think smat
Ms. Sue
21 - 3 = 18
39 - 21 = _____
57 - 39 = ______



ToxicCheese
They all equal 18 therefore the sequence of 3, 21, 39, 57 is 18.