1+\(\frac{1}{2}\)+\(\frac{1}{4}\)+\(\frac{1}{8}\)+ .......... ধারাটির প্রথম সাতটি পদের সমষ্টি নির্ণয় কর । 

A 127/64

B 128/127

C 129/128

D 125/128

Solution

Correct Answer: Option A

এখানে, a=1
r=1/2
S7 = 1 x (1-(1/2)7) / (1-(1/2))
     = (1- (1/128)) / (1/2)
     = (127/128) / (1/2)
     = (127 x 2) / 128
     = 127/64 

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