Asked by Itz
                What is  the sequence of  3 21 39 57 need help is so hard it says to think smat
            
            
        Answers
                    Answered by
            Ms. Sue
            
    21 -  3 = 18
39 - 21 = _____
57 - 39 = ______
    
39 - 21 = _____
57 - 39 = ______
                    Answered by
            ToxicCheese
            
    They all equal 18 therefore the sequence of 3, 21, 39, 57 is 18. 
    
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