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find the sum of 21 term …

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find the sum of 21 term of an ap whose middle term is 20

    • Posted by Mouli Gupta 6 years, 9 months ago

    CBSE > Class 10 > Mathematics
    • 2 answers

    Apratim Sarkar 6 years, 9 months ago

    420.

    2Thank You

    Monika Gupta 6 years, 9 months ago

    I dont Know

    3Thank You

    ANSWER
    http://mycbseguide.com/examin8/

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