Thank you for the opportunity to help you with your question!
a)We have the sequence as
Here the sequence is in geometric progression with common ratio =.5
The first term is 1
=155/16 (as a fraction)
So the sum =>-4+(-4)^2+(-4)^3+-------(-4)^9
So here the first term is -4 and total number of term =9
I am being told that the 1st sum, 155/16 is wrong
correct answer was 315/32
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