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30 June, 01:43

The first row of a conference hall has 8 chairs and 2 additional chairs in each subsequent row. How many chairs are in the 9th row? How many chairs in total are in the first 9 rows?

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  1. 30 June, 02:45
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    Ans:

    24 chairs in 9th row and 144 chairs in ist 9th rows

    Step-by-step explanation:

    ist row = 8

    2nd = 10

    3rd = 12

    .

    .

    .

    9th row = 24

    and if we add all chairs = 8+10+12+14+16+18+20+22+24 = 144
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