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please, help me !!
here, I found that,
f(1)* f(2)* f(3) *…f(n)=n, because the others will ultimately be cancelled out by each other.I am almost sure about this.
then, r=1 or r=0; but I am not so sure about this.
I can’t continue it, I am not understanding how will I find out the value of s.
So please help me, and correct me if I am wrong