cmoolah cmoolah

07-07-2017
Mathematics

contestada

What is S5 for 1000 + 500 + 250 + ...

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ghanami ghanami

07-07-2017

hello :
250/500=500/1000=1/2 ..(commmon ratio) of geoemtric sequence
the sum is : S= a1(1-r^n)/(1-r)
a1 = 1000 and n = 5 r = 1/2
S5 = 1000(1-(1/2)^5)(1-1/2)
S5 = calculate ........

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