please answer the question
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a + 3d = 0 -------> 4th term of ap
∴a = - 3d ---------> 1
LHS,
a + 24d--------> 25th term
-3d + 24d {∵ from 1]
=21d
RHS,
[a + 10d]3 ------------>3 times 11th term
[-3d + 10d]3
7d × 3d
=21d
LHS=RHS,
hence,proved
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