Most common sequence and series questions that come in entrance exams

@ nikita 

WHAT EXACTLY U WANT TO KNOW ?? 
i am sorry there is no attachment in the question , kindly attach the ques in which u have problems . 
and the most imp topics in that chap is sum of n terms and finding the g.p from that . 
for more detauils , check out askiitians study material . 
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ALL THE BEST ..