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CBSE Class 10 Answered

A.P.
Asked by adilalikhan | 01 Jun, 2008, 08:47: PM
Expert Answer

Let a be the first term and d be the common diffrence of the A.P.

nth term = a + (n-1)d

by the given condition, we get

10[a+9d] = 15[a+ 14d]

this implies, 10a + 90d = 15a + 210d

so, 5a = - 120d

so, a = - 24d

so, a + 24d = 0

so, the 25th term is equal to zero.

Answered by | 01 Jun, 2008, 10:50: PM
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