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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