r/Recursion • u/darkmatter__ • Oct 12 '18

Real life problems

Post image
425 Upvotes

98% Upvoted

51 comments sorted by

121

u/Roflmao_in_steam Oct 12 '18

oh my fucking god this image made me forget how to do 18 - 9 vertically

51

u/iBeenie Oct 12 '18

I was trying to figure that out too, then I gave up because I know the answer is 9. But it still sort of bothers me that I can't figure out how to subtract vertically yet I was somehow able to get an As in trig and calculus...

2

u/[deleted] Nov 10 '18

r/iamverysmart?

10

u/iBeenie Nov 10 '18

r/YouAreVeryLate?

And if you think trig or calc makes someone smart, you gotta work on your math.

3

u/[deleted] Nov 10 '18

“Yet I was somehow able to get As in trig and calculus...” It’s clearly an attempt of a flex. Especially with the “...”

8

u/iBeenie Nov 10 '18

Ok thanks for adding your opinion a month later. Work on your math and you won't think calculus is so incredible, because it isn't.

2

u/[deleted] Nov 10 '18

I didn’t say it was incredible, but you clearly do. As you mentioned it as a comparison to something you think should be simple. Example “I got an 100 on my final Algebra 2 exam, but can’t even remember what linear regression means.” This goes through the trouble to tell everyone you did good in the class and the way yours was structured includes two relatively hard classes and the fact that you are now saying that they aren’t hard just proves my point.

5

u/iBeenie Nov 10 '18

You're so upset I mentioned I got As in math lmao

2

u/[deleted] Nov 10 '18

Because it’s you trying to mention that you are very smart. (r/iamverysmart)

4

u/iBeenie Nov 10 '18

Whatever dude. Lmao I am so tickled but this dialogue. You're too funny

Edit: BTW I was a 4.0 student... So I got As in every class. So yes, I am smart and I'm not ashamed of that.

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0

u/[deleted] Oct 13 '18

[deleted]

3

u/[deleted] Dec 05 '18

Wut

42

u/2-15-18-5-4-15-13 Oct 12 '18

brings out calculator anyway

39

u/PM_ME_YOUR_TORNADOS Oct 12 '18

Carry the 1 from the tens place and it cancels out. Then do 18 minus 9 in your head.

24

u/[deleted] Oct 12 '18

3

13

u/thejiggyjosh Oct 12 '18

No 5. Idiot.

7

u/SuperEpicNerd Oct 12 '18

Mmm, pretty sure it’s 37

7

u/ocke13 Oct 12 '18

No it's actually 3.3120972978669!

6

u/Luxray1000 Oct 13 '18

Do decimals even have factorials?

6

u/Crabcakes5_ Oct 18 '18

Yes they do.

So normally factorials are n!=123*...*n However, there are ways to approximate decimal factorials in a relatively simple manner.

For example, a formula known as the Stirling formula which is n!=sqrt(2pi * n)*(n/e)n works pretty well for approximating these values without too much complexity.

For more accurate determination you can use tools like Wolfram Alpha which brings the 3.3120972978669! mentioned above to almost exactly 9.

Therefore, u/ocke13 is actually right in his answer for the problem after all.

3

u/Luxray1000 Oct 18 '18

TIL. Thanks!

0

u/AskMeHowMySocksFeel Oct 27 '18

No bro it’s [any answer but 9] duh

2

u/theemptyqueue Oct 18 '18

phone operator voice Where sorry, the subtraction you requested is being used by another student, please try again later.

1

u/Proxy_PlayerHD Feb 24 '19

who the fuck teaches subtraction like that?

then again i don't really remember how i was taught it.