anonymous
  • anonymous
find the value of the sum: summation j=0 until j=8; (1+(-1)^j))
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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KonradZuse
  • KonradZuse
plug it in?
KonradZuse
  • KonradZuse
\[\sum_{0}^{8} (1+(-1)^j)\]
anonymous
  • anonymous
we need to use the formula for progresion. but i dont know how. bec the formula is : n(a sub 1 +a sub n) /2

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anonymous
  • anonymous
but is the zero considered ":a sub 1 or a sub 0,?"
KonradZuse
  • KonradZuse
Idk why you need a formula... unless I'm missing something.. You should be able to just plug in and get your answer...
anonymous
  • anonymous
the instructions say use th formla
KonradZuse
  • KonradZuse
n should be 8, but not too sure about a, maybe the current #? I haven't done this in awhile :P.
anonymous
  • anonymous
wait, without the formula the answer is 10?
KonradZuse
  • KonradZuse
yes. correct!e
anonymous
  • anonymous
hmm so this formula is not giving me that answer. no matter which numbers i put in.

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