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27 July, 15:47

Find a20, the 20th term, of the arithmetic sequence 1, 3, 5, 7, 9, ...

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  1. 27 July, 16:03
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    A=1

    common difference d=3-1=2

    nth term = a + (n-1) d

    2oth term = 1 + (20-1) 2

    =1+38

    =39
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