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BlizzardofFire

  • 3 years ago

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

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  1. RadEn
    • 3 years ago
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    use formula : s= a/(1-r) with a=first term r=ratio=u2/u1=u3/u2

  2. BlizzardofFire
    • 3 years ago
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    huh?

  3. HELLSGUARDIAN
    • 3 years ago
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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)

  4. RadEn
    • 3 years ago
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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!

  5. BlizzardofFire
    • 3 years ago
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    soooo its 3/4??

  6. HELLSGUARDIAN
    • 3 years ago
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    yup

  7. HELLSGUARDIAN
    • 3 years ago
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    sorry i did a mistake in the formula it will be a/(1-r)

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

  9. RadEn
    • 3 years ago
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    yea, that's right.

  10. HELLSGUARDIAN
    • 3 years ago
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    yes here the ratio(r) is 1/2 ..

  11. BlizzardofFire
    • 3 years ago
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    k thx

  12. RadEn
    • 3 years ago
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    oke, what's answer do u get ?

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