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How many terms of the AP …

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How many terms of the AP 9' 17' 25'•••••••••••••••must be taken to give a sum of 616

    • Posted by Rajesh Chauhan 6 years, 11 months ago

    CBSE > Class 10 > Mathematics
    • 2 answers

    Neha Sirur 6 years, 11 months ago

    Sn=n/2 (2(9)+(n-1)8) 616=n/2(18+8n-8) 616= n/2( 10+8n) 1272= 10n+8n2 Whole divided by 2 4n2+5n-636=0 By solving n= 12,-53/4 Therefore n=12

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    Anshika & Aliens???? 6 years, 11 months ago

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