Grade 11IIT JEE Entrance Exam

Please explain how to solve the question in image . Solution is also given please explain

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Sudhanva G V

7 Years agoGrade 11

1 Answer

Deepak Kumar Shringi

7 Years ago

first line of solution as a1 ,a2 ...are in AP then 1/a1,1/a2......will be in AP
then they assumed 1/a2-1/a1=d from there in 2^ndlast step
they found already a1a2+a2a3+a3a4/a1a4=3
so root is 3

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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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Please explain how to solve the question in image . Solution is also given please explain

Sudhanva G V

1 Answer

Deepak Kumar Shringi

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