The sum of 15th term of ap is 600 and the common difference is 5 . Find the first term of an ap?
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given The sum of 15th term of ap is 600
d=5
15/2(2*a+14*5)=600
or (2*a+14*5)=80
or 2a=80-70
or a(¹st term)is 10/2=5
5 is right answer..
d=5
15/2(2*a+14*5)=600
or (2*a+14*5)=80
or 2a=80-70
or a(¹st term)is 10/2=5
5 is right answer..
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