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/sci/ - Science & Math

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7057065 No.7057065 [Reply] [Original]

Help me, /sci/.

I consider myself "okay" at math. I'm not the best, but if I take my time and I look at something or someone walks me through it, I understand and learn from it and usually don't have a problem anymore.

I recently had an algebra and patterns test, and the one question I got wrong I literally cannot fucking understand.

It's "Find the missing number in these patterns of numbers".

The first one is

8, 12, 18, 24, __, 36, 42.

Obviously, 30. It just increases by 6 every time. Makes sense.

The one that I fucked up?

3, 11, 19, ___, 35, ____, 43.

I assumed it just went up by 8 every time, so the first blank would be 27, but the 35, _____, 43 gap is fucking me up. I literally cannot fathom a different kind of increase.

Am I retarded or is the test fucked?

>> No.7057093

Are you retarded?
43 - 35 = 8.

>> No.7057096

>>7057093
Wait never mind, I'M retarded.

>> No.7057107

>>7057093
>>7057096

I know, right? It has to be 8. It's almost like the second blank is a fucking mistake or something on the test.

>> No.7057122

But that first one goes up by 4 the first time, or is that another typo?

>> No.7057131

Looks like a mistake. Were there any other sequences with more than one blank space?

>> No.7057136

>>7057122
Ooops. That was my fuck up; it's 6 for the first digit, not 8.

>>7057131
No. Literally the only one. I think it's a fuck up.

>> No.7057202

>>7057065
its not a fuck up.

the number that belongs in the second blank is 39 OP. ill leave you to it to figure out why.

>> No.7057206

>>7057202
or a strong case can be made for 41.

>> No.7057250

>>7057206
>>7057202
OK, I'll bite.

How the fuck can it be either 39 or 41?

>> No.7057280

>>7057250
The numbers are all odd. so in both spaces you fill in all the odd numbers that can be put there. for instance for the first blank, its an odd number between 19, and 35.

do the same for the second space.

now you have 3 and 43 on either end. the tenth place is held by the odd number 3, the second number is 11, and a blank, 41 fits into that blank on the basis of the tenth number being odd and matching, for the first blank you take a number in-between 19, and 35 with the only odd tenth number that hasn't been used. which s 7. so 27 is the first blank.


or its a fuck up

>> No.7057290

>>7057280
Yeah, that makes sense. It's every 4th odd number from 3.

Can't believe I missed that.

>> No.7057305

>>7057290
Can't tell if trolling.

>> No.7057316
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7057316

>>7057305
What?

>> No.7057322

>>7057316
Doesn't account for second blank.

>> No.7057336

>>7057316
Shit, it doesn't.

>> No.7057340

>>7057336
It's gotta be typo...im sure OP is long gone, but this is still bothering me.

I can only hope he comes back one day and puts my mind at ease.

>> No.7057344

>>7057340
There are so many patterns that COULD have worked, if it's a typo:

Increase by 8
A number in the middle of two other numbers is the average of those
Every 4th odd number
etc.

>>7057280
This just seems convoluted.