Tonmoy ji kindly tell me from where you have given this problems, if this is possible for you. Today I taught my student same topic and want to include these some in my DPP.
This seems from algebra book by Barnard I guess. From the printing I guess.
Yes sir you are correct...
Thanks a lot
Most welcome sir do you have hall and knight algebra
For q.28 add and substract 1 from numerators of each term and gerenate difference series and hence answer would be
Sn = 1 - 1/(1+a1)(1+a2).....(1+an)