Doubt from summation of series

summation
sm
moderate
sequence-series
unsolved
#1

#2

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#3


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.

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#4

This seems from algebra book by Barnard I guess. From the printing I guess.

#6

Yes sir you are correct...

#7

Thanks a lot

#8

Most welcome sir do you have hall and knight algebra

#9

Off topic

#10

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)

#11