Answers to these RPN arithmetic problems Quiz by Ignis_Umbrae

Can you name the answers to these RPN arithmetic problems?

created by Ignis_Umbrae

Enter a Answer in the box below
Correctly named Answers will show up below
Answers MUST be guessed in order
Source: Wikipedia
All problems are given in Reverse Polish notation (RPN); if you don't know what RPN is, see the source link for Wikipedia's explanation. The caret symbol (^) is the exponentiation operator.
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Problem	Answer
2 3 + = ?
9 8 * =?
91 7 / =?
1 7 4 + + = ?
6 2 ^ 3 + =?
2 8 * 6 - = ?
7 3 - 7 * =?

Problem	Answer
4 7 - 1 2 - * = ?
11 4 3 + - 2 ^ =?
3 -2 ^ -2 ^ =?
7 1 15 3 / / / = ?
6 2 / 3 / 3 2 * * =?
6 5 4 3 2 1 ^ - / * + =?
11 7 7 4 * 11 5 + / / * =?

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There are 10 comments for this game.
(Warning: comments may contain spoilers)

Minute math(s): Reverse Polish edition Quiz

by Ignis_Umbrae

Created Sep 11, 2010 in Science
Game Plays 2,173

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	Ignis_Umbrae:	Sep 12th, 2010 at 03:00 GMT		2 points
	Pre-emptive FAQ: yes, this quiz is difficult. Yes, I'm a mathematician. No, I don't expect anyone to complete the entire thing in one minute, but one never knows when an RPN expert is just round the corner!

	sammyhain:	Sep 12th, 2010 at 03:19 GMT		-1 points
	why do they have to be guessed in order?

	smreidy113:	Sep 13th, 2010 at 12:10 GMT		2 points
	I actually think the hiding the next clue option is good. You can actually focus on the problem you have. It might be better, though, if you randomized the answers. That way, if someone wants to play again (like myself), it won't be repetitive. But as a math major hopeful, I give this quiz 40 8 / stars!

	Pit_trout:	Sep 13th, 2010 at 20:50 GMT		5 points
	Speaking as another mathematician: awesome! e i π * ^ 3 ! + sporcles!

	Ignis_Umbrae:	Sep 14th, 2010 at 01:45 GMT		3 points
	Wow! Thanks, everyone! I was expecting the comments to be full of rage and hatred, especially after using negative exponents and irreducible fractions! @smreidy: the reason they aren't randomized is that the problems are (supposed to, in theory) increase in difficulty. With randomization, it's possible for players to get extremely difficult problems first, which could badly skew their scores. Finally: thanks, PT! You've almost tempted me to make an RPN quarternion quiz using special functions...

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	zifyoip:	Sep 17th, 2010 at 14:22 GMT		4 points
	@THEJMAN: Nope, 6 2 ^ 3 + is 6^2 + 3.

	Ignis_Umbrae:	Sep 17th, 2010 at 23:43 GMT		3 points
	@THEJMAN: 6 2 ^ in RPN is 6^2 in infix notation (the usual notation). You seem to have evaluated part of the expression as being infix, and part of it as being RPN (postfix). I made sure to triple-check all of the answers with an RPN calculator, so I'm confident that they're correct!

	cuatrodosocho:	Nov 27th, 2010 at 02:44 GMT		1 point
	I'm sorry, but can you explain the eighth problem for me? The way I've figured it, it's ( 4 - 7 ) = -3 - 1 = -4 * 2 = -8.

	zifyoip:	Dec 15th, 2010 at 15:47 GMT		3 points
	@cuatrodosocho: The eighth problem is "4 7 - 1 2 - ". This should be interpreted as (4-7)(1-2). The second minus sign applies to the 1 and the 2, and the asterisk applies to (4 7 -) and (1 2 -).