Pls answer this Q.
Solution is needed urgently.
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First of all :
Grouping of terms :
This is very interesting .
As a class 10 boy , I will not do it complexly .
is always divisible by a + b when n is odd.
Obviously n = 1997 is odd .
is divisible by 1996 + 1 = 1997.
So every number in the series is divisible by 1997 .
Hence we proved it.
Prakhar2908:
It should be when n is odd
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