how many terms of the ap 9 17 5 .............must be taken to give a sum of 636
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sn=n/2{2a+(n-1) d}
636=n/2{2x9 +(n-1)x8}
636=n/2{18 +8n-8}
636=9n+4n^2-4n
636=4n^2+5n
4n^2+5n-636=0
ax2 +bx+c=0
solving n=12
No. of terms=12. . Ans
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