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20 June, 08:33

How do you describe the sequence 7,14,21,28

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  1. 20 June, 09:20
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    The first term, a is 7.

    The next term is increased by adding 7.

    The sequence is an Arithmetic Sequence.

    The common difference d = 14 - 7 = 21 - 14 = 7

    For Arithmetic, an = a + (n - 1) d

    The nth term = 7 + (n - 1) 7 = 7 + 7 (n - 1)

    = 7 + 7n - 7 = 7n

    = 7n
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