1.

of6thand10thtermsis4erinIl0IthesumI0anA.P.is24andthe4thandsthtermsofFind35. ThesumofFind the A.P.[CBSE. 2009]

Answer»

A4+a8=24a+3d+a+7d=242a+10d=24. .........1

a6+a10=34a+5d+a+9d=442a+14d=44. .,.......2Subtracting 2 from 12a+14d=442a+10d=24- - -4d=20d=4/20or 1/5Put d= 1/5 in 12a+10×1/5=242a+2=242a=24-22a=22a=11

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