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BlizzardofFire Group Title

s=1-1/3+1/9-...

  • one year ago
  • one year ago

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  1. RadEn Group Title
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    use formula : s= a/(1-r) with a=first term r=ratio=u2/u1=u3/u2

    • one year ago
  2. BlizzardofFire Group Title
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    huh?

    • one year ago
  3. HELLSGUARDIAN Group Title
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    its a geometric progression with contant ratio(r)=-1/3 and its first term(a) is 1 hence we can use a formula for the sum of this g.p. as a(1-r)

    • one year ago
  4. RadEn Group Title
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    ok, a=1 and r=(-1/3)/1 = -1/3 plug in a=1 and r=-1/3 to that formula!

    • one year ago
  5. BlizzardofFire Group Title
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    soooo its 3/4??

    • one year ago
  6. HELLSGUARDIAN Group Title
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    yup

    • one year ago
  7. HELLSGUARDIAN Group Title
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    sorry i did a mistake in the formula it will be a/(1-r)

    • one year ago
  8. BlizzardofFire Group Title
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    do u do it the same way when the question is 4/3+2/3+1/3...

    • one year ago
  9. RadEn Group Title
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    yea, that's right.

    • one year ago
  10. HELLSGUARDIAN Group Title
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    yes here the ratio(r) is 1/2 ..

    • one year ago
  11. BlizzardofFire Group Title
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    k thx

    • one year ago
  12. RadEn Group Title
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    oke, what's answer do u get ?

    • one year ago
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spraguer (Moderator)
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is replying to Can someone tell me what button the professor is hitting...

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