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In an A.P, if five times …

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In an A.P, if five times the fifth term is equal to seven times the seventh term, the show that twelfth term is zero.

Posted by Soni Verma 5 years, 11 months ago

CBSE > Class 10 > Mathematics

3 answers

Heenal Kalal 5 years, 11 months ago

5(a+4d) = 7(a +6d) 5a+20d = 7a +42d 7a-5a+42d-20d=0 2a+22d=0 2(a+11d)=0 a+11d=0

Akanksha Kumari? 5 years, 11 months ago

12th term = a+11d = -11d + 11d = 0. Hence proved..

Akanksha Kumari? 5 years, 11 months ago

5(a+4d) = 7(a+6d) 5a+20d = 7a+42d -2a = 42d - 20d -2a = 22d a= -11d

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