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I think i am forgetting an important formulae in this question ... Can anyone guide me through it ? plz.

I think i am forgetting an important formulae in this question ...
Can anyone guide me through it ? plz.

Question Image
Grade:12

2 Answers

Harsh Patodia IIT Roorkee
askIITians Faculty 907 Points
5 years ago
This is sum of GP
​Sn = a( r​n -1 )/ r-1
NARAYANA
242 Points
5 years ago
THIS INDICATE THAT THE WRITTEN SERIES IN GEOMETRIC PROGRESSION BECAUSE OF THIS IS AN SUB FORMULA OF GP AND MOST IMPORTANT FORMULA.

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