Asked by Anonymous
If the sum of the 8th and the 9th of an a.p is 72 and the 4th term is -6 .find the common difference
Answers
Answered by
Anonymous
Please solve
Answered by
oobleck
you know, making a second post saying "please solve" isn't really necessary. We assume that when you post a math problem, you want it solved!!
So, it's been an hour -- have you solved it yet? If not, start with
a+7d + a+8d = 72
a+3d = -6
now solve those as usual.
So, it's been an hour -- have you solved it yet? If not, start with
a+7d + a+8d = 72
a+3d = -6
now solve those as usual.
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