Let A1,A2,---------An be the vertices of an n sided regular polygon such that1/A1A2=1/A1A3+1/A1A4,FIND THE VALUE OF n

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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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