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October 21, 2014

October 21, 2014

Posted by **noor** on Tuesday, February 28, 2012 at 10:51am.

th

term of an AP is equal to 15 times its 15

th

term, show that its25

th

term is zero.

- arithmetic -
**Steve**, Tuesday, February 28, 2012 at 11:59amT10 = a+9d

T15 = a+14d

10(a+9d) = 15(a+14d)

10a + 90d = 15a + 210d

5a = -120d

a = -24d

T25 = a + 24d = -24d + 24d = 0

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