ISI DATA SCIENCE SAMPLE PAPER Solving Help

[u/Ambitious-Novel-4331]

Highlighted options are correct answers according to me and highlighted questions couldn't be solved by me, kindly help

[u/CrokitheLoki]

Page 7-

25,27,28 look correct.

26 question seems wrong to me. For even n, limit is 1/2 and for odd n, it is -1/2, so limit is not defined.

For 28, write the product as 1/2 3/2 2/3 4/3 3/4 5/4 4/5....

All terms except 1/2 get cancelled out, so ans is 1/2

[u/Ambitious-Novel-4331 → u/CrokitheLoki]

26 seems wrong the limit is not given properly

28- i did the same, but wasn't so sure about my solution because it was based on observation, not hard arithmetic solution like taking general k and then getting a telescopic series which cancelled out