the sum of first 13 terms of arithmetic sequence is 299 and next 12 terms is 726 find d?

Question

the sum of first 13 terms of arithmetic sequence is 299 and next 12 terms is 726 find d?

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Bella 1 month 2021-08-20T09:25:40+00:00 1 Answer 0 views 0

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    2021-08-20T09:27:12+00:00

    Answer:3

    Step-by-step explanation:

    s13=299

    13/2*(2a+12d)=299

    2a+12d=(299*2)/13

    2a+12d=46

    a+6d=23

    s25=1025

    25/2*(2a+24d)=1025

    2a+24d=(1025*2)/25

    2a+24d=82

    a+12d=41

    from the above 2 equations

    6d=18

    d=3

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