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18 April, 00:56

Which answer describe the type of sequence? 3,9,15,21

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  1. 18 April, 02:08
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    The sequence is arithmetic

    we know that

    In an arithmetic sequence, the difference between consecutive terms is always the same and is called common difference

    In this problem we have

    3,9,15,21, ...

    Let

    a1=3, a2=9, a3=15, a4=21

    a4-a3=21-15=6

    a3-a2=15-9=6

    a2-a1=9-3=6

    The sequence is arithmetic

    The common difference is equal to
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