1.

Let P = sum_(r=1)^(50)(""^(50+r)C_(r)(2r-1))/(""^(50)C_(r)(50+r)), Q = sum_(r=0)^()(""^(50)C_(r))^(2), R = sum_(0)^(100)(-1)^(r)(""^(100)C_(r))^(2) If n is any positive integer, then findthe number whose square is ubrace(111..........1)_("2 times")-ubrace(222..........2)_("n times")

Answer»


ANSWER :`ubrace(333"......"3)_("N TIMES")`


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