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The 7th term of an AP …

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The 7th term of an AP is _4 and its 13th term is_ 16 find AP

Posted by Harsharn Kaur Sandhu 6 years, 10 months ago

CBSE > Class 10 > Mathematics

1 answers

Aqsa Irfan 6 years, 10 months ago

a7=4 a+6d=4.........[1] a13=16 a+12d=16......[2] [2]-[1] 6d=12 d=12/6 d=2 Substituting d=2 in [1] a+6d=4 a+12=4 a=-8 Therefore,AP= -8,-6,-4,-2,0,2,4,6,8,10,12,14,16,.....

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Find the nature of quadratic equation x^2 +x -5 =0

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