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How many terms in Ap 9,17,25....must …

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How many terms in Ap 9,17,25....must be taken to give a sum of 636

    • Posted by Hacker# Anurag 6 years, 1 month ago

    CBSE > Class 10 > Mathematics
    • 2 answers

    Payal ..... ?? 6 years, 1 month ago

    See... We know a= 9 and d=8 okkk.... And the sum is given.. And we know that the formulae for geetiing the sum of aps.... So.. By using....... Sn =n/2 (2a+(n-1)d).... So now put all the values of a and d... Then... We will get the equation... 636= 5n +4n² after that u have to factorise u will get two value first in negative and second will in positive so put positive term which is........... 12.... ????

    2Thank You

    Payal ..... ?? 6 years, 1 month ago

    12... Terms... Dude....

    3Thank You

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    Posted by Kanika . 1 month ago

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