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lisa123

  • one year ago

The symbol {x} represents the sum of all the integers from 1 to x. For example {4}=1+2+3+4=10 If {a}-{b}=8, What could b equal?

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  1. lisa123
    • one year ago
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    Please help me @Loser66

  2. Loser66
    • one year ago
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    {a}-{b}={8} {a}-8={b} hence a must be 8 and b =7 . let check a =8 {8}= 1+2+3+4+5+6+7+8 {8}-8 = 1+2+3+4+5+6+7 ={7}={b}

  3. Loser66
    • one year ago
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    the first line is {a}-{b}=8, not ={8}

  4. Loser66
    • one year ago
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    However, I don't know how to put it in logic yet. Just use "try and error" method to find it out. It might have other solution but I didn't find it out yet.

  5. Loser66
    • one year ago
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    @myko What do you think?

  6. lisa123
    • one year ago
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    This is an SAT question and the options are 8 7 6 2 1

  7. Loser66
    • one year ago
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    oh, it is quite easy now. So, 7 is the solution

  8. anonymous
    • one year ago
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    i would say: \({a}-{b}= |n_1 +n_2 \cdots a|=8\) where n are consecutive integers. So a + this integers must sum 8. Now just check which can match this.

  9. anonymous
    • one year ago
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    i ment {a}-{b} in the first line

  10. lisa123
    • one year ago
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    If a=8 and b=7 Then is it 36-28=8?

  11. anonymous
    • one year ago
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    yes, thats the only possible solution

  12. lisa123
    • one year ago
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    Okay it makes sense now thank you gym for helping me :)

  13. anonymous
    • one year ago
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    |dw:1433428975656:dw|

  14. lisa123
    • one year ago
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    There are none @myko

  15. anonymous
    • one year ago
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    there are. Just 8 alone

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