JazzyMathNerd JazzyMathNerd

14-03-2018
Mathematics

contestada

Find the sum of a 9-term geometric sequence when the first term is 4 and the last term is 1024?

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sqdancefan sqdancefan

14-03-2018

The common ratio is 2, so the sum is
.. a1*(r^n -1)/(r -1)
.. = 4*(2^9 -1)/(2 -1)
.. = 4*511
.. = 2044

The sum of the sequence is 2044.

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