The 11th term and 21st term of an A.P.are 16 and 29 respectively then find 31 term of an A.P​

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The 11th term and 21st term of an A.P.are 16 and 29 respectively then find 31 term of an A.P​

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Ella 1 week 2021-10-07T12:23:23+00:00 1 Answer 0 views 0

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    2021-10-07T12:24:52+00:00

    Step-by-step explanation:

    1. a11-16
    2. a+10d=16–equation1
    3. a21-29
    4. a+20d=29—equation
    5. subtracting 1 and 2
    6. a+10d=16
    7. -a-+21d=-21
    8. =-11d=-15
    9. d=15/11
    10. putd=15/11 in 1
    11. a+110/15=16
    12. 15a+110=240
    13. 15a=240-110
    14. a=130/15=26/3
    15. a31=26/3+30(15/11)
    16. =26/3+450/11
    17. 286+135/33
    18. =421/33

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