Asked by curious student

write the following in a sigma notation
3/32+3/16+3/8+...+12288

so far ive gotten that a=3/32 and r=2/1

can you please help me further
Answered by Reiny
sum = [sigma] 3/2^(6-i), i from 1 to 18
Answered by curious student
what does "i" stand for?
Answered by Reiny
In sigma notation we traditionally use i or n as the index of the notation.

You had asked for the expression in "sigma notation"

What you started doing is attempting to add up the values using a geometric series.
What you started is correct, but that was not asked for.

If you want the actual sum, you will first have to find how many terms there are, that is, what term number is 12288

the use the formula
S<sub>n</sub> = a(r^n - 1)/(r-1)
Answered by curious student
thank you muchly!
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