pls answer it asap..its urgent
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For n=1 , n^2 = 1
So , a=1
Now , n=2 , n^2 = 4
a+a+d = 4
d = 2
So , a=1
Now , n=2 , n^2 = 4
a+a+d = 4
d = 2
Ricky11111:
thanx mate
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If a=1, if not as the answer follows
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thanx mate
but is this legit..??i mean the last step
How can you presume a=1?
As I said i f a=1 it is 2
If not 2(n-a)/n-1
Its always be 2
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