The base BC of a triangle ABC contains the points P(p1, q1) and Q(p2, q2) and the equation of sides AB and AC are p1x + q1y = 1 and q1x + p2y = 1 respectively. Then the equations of AQ is Options

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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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