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20 May, 21:06

What is the closed linear form of the sequence 5, 7.5, 10, 12.5, 15, ... ?

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  1. 20 May, 21:10
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    First term = a1=5

    common difference=7.5-5=10-7.5=2.5

    so an=a1 + (n-1) d

    so

    an=5 + (n-1) * 2.5

    an=5+2.5n-2.5

    an=2.5+2.5n
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