lisa123
  • lisa123
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?
Mathematics
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SOLVED
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katieb
  • katieb
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lisa123
  • lisa123
Please help me @Loser66
Loser66
  • Loser66
{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}
Loser66
  • Loser66
the first line is {a}-{b}=8, not ={8}

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Loser66
  • Loser66
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.
Loser66
  • Loser66
@myko What do you think?
lisa123
  • lisa123
This is an SAT question and the options are 8 7 6 2 1
Loser66
  • Loser66
oh, it is quite easy now. So, 7 is the solution
anonymous
  • anonymous
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.
anonymous
  • anonymous
i ment {a}-{b} in the first line
lisa123
  • lisa123
If a=8 and b=7 Then is it 36-28=8?
anonymous
  • anonymous
yes, thats the only possible solution
lisa123
  • lisa123
Okay it makes sense now thank you gym for helping me :)
anonymous
  • anonymous
|dw:1433428975656:dw|
lisa123
  • lisa123
There are none @myko
anonymous
  • anonymous
there are. Just 8 alone

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