The 4th term of an A.P. is zero.
Prove that the 25 term of the A.P. is three times to its 11th term.
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the value od a4 will be -3d .
put it in the value of a25.
The value of a25 will come 21d
And the value of a11 will come 7d
Therefore a25=3(a11).
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