anonymous
  • anonymous
Calculate the following sum (100 values): + 11 13 15 ... 209
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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ash2326
  • ash2326
@Social We have the series, let the sum be S S=11+13+15..............+207+209 I can also write sum as S=209+207.....+15+13+11 Do you follow this?
anonymous
  • anonymous
i know it
anonymous
  • anonymous
then? i do not remember

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ash2326
  • ash2326
okay, then let's add the two series, we'll add term by term 11+209=220 13+207=220 15+205=220 so we get 2S=220+220+220.....+220+220 Do you follow this?
anonymous
  • anonymous
yes
ash2326
  • ash2326
can you find the sum from here? it's just a step
anonymous
  • anonymous
11000
ash2326
  • ash2326
correct :) did you understand the solution?
anonymous
  • anonymous
yes... this is very clever it means that i will have the same result with different numbers
anonymous
  • anonymous
many many years since school... i forgot them.. thank you!!
ash2326
  • ash2326
Welcome :D

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