Math, asked by Sujatamohanty, 11 months ago

how many terms of the ap 9 17 5 .............must be taken to give a sum of 636

Answers

Answered by haridasan85

2

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

Answered by subhrajena189

0

Answer:

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