If for an A.P. 135,131,127, ....is its first negative term
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Solution:
AP : 135,131,127,.....
a = 135
d = 131-135 = -4
For a negative term ,
Tn < 0
a+(n-1)d < 0
135+(n-1)(-4) < 0
-4n+4 < -135
-4n < -139
4n > 139
n > 139/4 or 34¾
For first negative term n = 35
AP : 135,131,127,.....
a = 135
d = 131-135 = -4
For a negative term ,
Tn < 0
a+(n-1)d < 0
135+(n-1)(-4) < 0
-4n+4 < -135
-4n < -139
4n > 139
n > 139/4 or 34¾
For first negative term n = 35
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