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The eighth term of an A.P …

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The eighth term of an A.P is half its second term and eleventh term exeed one third of its fourth term by 1 . Find the 15th term

Posted by Mervin Joel 6 years, 11 months ago

CBSE > Class 10 > Mathematics

2 answers

Anushka Jugran ? 6 years, 11 months ago

15th term is 3

1Thank You

Gurjar Kabir (बैंसला) 6 years, 11 months ago

Sol......... A8=a+7d=a+d/2 ...... 2(a+7d)=a+d .......... 2a+14d= a+d 2a-a+14d-d=0 a+13d=0. ...... (i) A+10d=a+3d/3+1 . A+10d=(a+3d+3)/3 3(a+10d)=a+3d+3 3a-a+30d-3d-3=0 2a+27d=3. ... (ii) Solve (i)&(ii) Eq(i) multiply by 2 2a+26d=0......(iii) 2a+27d=3.......(iv) Solve (iii) & (iv) D=3 Put d in (i) A+39=0 A= -39**** D=3 A15=a+14d =. - 39+14(3)=. - 39+42=. 3 A15 is 3 Answer is 3 I hope this answer helps u

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CBSE > Class 10 > Mathematics