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30 January, 22:43

An auditorium has 51 seats in the first row, 55 seats in the second row, 59 seats in the third row, and so on. Find the general term of this arithmetic sequence and the number of seats in the twentieth row.

The general term a Subscript nan of this arithmetic sequence is nothing. (Simplify your answer.)

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  1. 31 January, 01:34
    0
    127 seats

    Step-by-step explanation:

    r = row s = seats

    s = 47+4r

    s = 47+4*20

    s = 47+80

    s=127
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