I take onsite courses at college, however I still end up with so much online work to do… i swear there are some problems that they programmed false answers for. like this one:
what do you's think?there's also this one, which seemed like it didn't offer a valid answer so i randomly guessed:
the answer they say is correct still doesn't seem right to me.
The very very very simple answer to why no. 7 was wrong is pretty much what Kenon said. (Which was basically that 1 + 1 = 2, not 3, for consecutive integers)
Also, the question itself is flawed in that no 3 consecutive odd integers can add up to 386 and in fact no 3 odd integers at all can ever add up to 386, because 3 odd integers always sum up to another odd integer. How come nunya bitches caught that? >:( 64d I am disappoint! EDIT kilin got it. IM PROUD SONTo expand your equation, lets assume the target sum is 9. Obviously, this is 1 + 3 + 5 (3 consecutive integers). In this case, your x is going to be 1. But if you use your selected equation, the result would be 1 + (1+1) + (1+3) or 1 + 2 + 4, which A) is definitely not the answer, and B) doesn't even add up to 9.Protip: An easy way find the three consecutive odd integers it is to simply take the full sum, divide it by three to get the middle number, and then add/subtract two to get your other numbers (Or you can divide by 3 and subtract 2 to get your x)Lets use 387, which actually works. Divide it by 3, you get 129, add/subtract 2 to get 127 and 131, and voila! Your 3 consecutive odd numbers are 127, 129, and 131.I was about to slappedeth you, DF, but the tinytext hath saved you for now.
@Death, what I meant was: whe left side of the equation is always odd, yet they claim the right side of the equation is even (386), which is impossible.
okay i get why no.7 is wrong now. i had gotten confused because the common questions i answered in my text book for homework assignments didn't ask for this the same way. my professor prepared me for a totally different question which never came up in this assignment at all. the two questions are similar and therefor i without even thinking selected the one with odd numbers being added to x.
as for no.15… i still don't get it. also just to point out again; the answer i chose is NOT what i believe in; the answer i got was not in the select-able answers so i chose one randomly.EDIT: actually testing out their answer for 15 gives me the same value that my equation (note: not the one i chose) gives me… hmm so if i had actually tested the equations and gotten the value i would have realized which one was the right answer… lulz.