The equation of the bisector of the acute angle between the lines2x-y+4=0 and x-2y=1 is :A.x+y+5=0;B.x-y=5;C.x-y+1=0;D.x-y+5=0

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Sum of series 2[n/2] ! [n/2]!/ n! [2Co-2C2+3C2....+[-1]^n[n+1]2Cn] where n is an even positive integer. Kindly provide solution of this question and how to generalise this. How do we know that which expansion will give this?

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