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The 4th term of an A. …

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The 4th term of an A. P. Is zero.. Prove that the 25th term of an A. P. Is three times it's 11th term

Posted by Navneet Kaur 5 years, 2 months ago

Yogita Ingle 5 years, 2 months ago

Let first term of an A.P=a

common difference of A.P=d

According to the question,

a+3d=0.......(1)

25th term =a+24d

from (1)...a=−3d

=> −3d+24d

=> 21d.....(2)

11th term=a+10d

=−3d+10d

=7d.....(3)

By (3) and(2) 25th term=3× 11th term

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CBSE > Class 10 > Mathematics