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The 4 th term of an AP is 0.prove that the 25th term of an AP is 3 times its 11th term.

Posted by Last Bencher 6 years, 10 months ago

CBSE > Class 10 > Mathematics

3 answers

Kamboj Ji 6 years, 10 months ago

a+3d=0 (eq..1) given, a=-3d.(eq 2) Now , A+24d=3(a+10d) to prove.. Substitute value of a, -3d+24d=-9d+30 , 21d=21d .. Therefore proved.. NOT SURE SO PLEASE ANY TEACHER CHECK MY WAY.

0Thank You

Last Bencher 6 years, 10 months ago

Anusree r u a malayali

0Thank You

Anusree Unnikrishnan 6 years, 10 months ago

it has been given that a4=0 => a+3d=0 => a= -3d ------- (1) a11= a+10d = -3d+10d = 7d [ from (1)] a25 = a+24d = -3d+24d = 21d [ from (1)] therefore, comparing 7d and 21d we get, 21d = 3 ( 7d ) i.e. a25 = 3(a11) Hence, proved. Hope it helps.

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Posted by Kanika . 1 month, 2 weeks ago

CBSE > Class 10 > Mathematics