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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Shashi ranjan sinha
see the attachments
here u is mobius function ...sorry i didn't mentioned
Yes....I understood
That's why I used a result of mobius function in second pic
in second pic , mobius functional value of 1 is 1 and it is zero for all other positive integers
if you wish, I will give you a proof of this result that I am talking about
ok give
see this