An ap consists of 50 terms of which 3rd term is 12 and last term is 188 find the 39th term
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Answer:
n=50
a3=12
an=188
a39=?
a+2d=12
a+49d=188
equation (1)and(2)
a+49d=188
a+2d=12
47d=178
d=4
a+2d=12
a+2(4)=12
a=12-8
a=4
a39=a+38d
=4+38(4)
=4+152
a39=156
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