show that 25 th term of A.P is equal to 3 times of the 11 term of A.P if 4th term of A.P is zero
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T4 = 0 ; a + 3d = 0 ..... (1)
T25 = a + 24d = a +3d +24d = 0+ 24d = 24d ......(2)
T11 = a+ 10d = a+3d+7d = 0+7d= 7d .....(3)
Comparing (2) &(3) ,
T25 = 3 T11
T25 = a + 24d = a +3d +24d = 0+ 24d = 24d ......(2)
T11 = a+ 10d = a+3d+7d = 0+7d= 7d .....(3)
Comparing (2) &(3) ,
T25 = 3 T11
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