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liliy

  • 3 years ago

find the value of the sum: summation j=0 until j=8; (1+(-1)^j))

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  1. KonradZuse
    • 3 years ago
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    plug it in?

  2. KonradZuse
    • 3 years ago
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    \[\sum_{0}^{8} (1+(-1)^j)\]

  3. liliy
    • 3 years ago
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    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

  4. liliy
    • 3 years ago
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    but is the zero considered ":a sub 1 or a sub 0,?"

  5. KonradZuse
    • 3 years ago
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    Idk why you need a formula... unless I'm missing something.. You should be able to just plug in and get your answer...

  6. liliy
    • 3 years ago
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    the instructions say use th formla

  7. KonradZuse
    • 3 years ago
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    n should be 8, but not too sure about a, maybe the current #? I haven't done this in awhile :P.

  8. liliy
    • 3 years ago
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    wait, without the formula the answer is 10?

  9. KonradZuse
    • 3 years ago
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    yes. correct!e

  10. liliy
    • 3 years ago
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    hmm so this formula is not giving me that answer. no matter which numbers i put in.

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