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ruoxi.wang
@ruoxi.wang
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Created
2018-03-03 16:03
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ruoxi.wang
mathematics
2018-03-26 21:00
RE: Brainsteem Mathematics Challenges: Factorial Sum
Hi, @rycharde, thank you for the problem and response. I should have triple checked before answering, especially when it was done by tapping solution on a phone and right before bed :p The path 1-3 is
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ruoxi.wang
mathematics
2018-03-26 13:15
RE: Brainsteem Mathematics Challenges: Factorial Sum
Interesting problem, here is my solution: Firstly, 2^n is an even number, therefore a!, b! and c! must be either: 3 even numbers, or: 1 even and 2 odd numbers. Factorials are all even except 1! Path 1:
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ruoxi.wang
busy
2018-03-21 07:02
RE: Another Brain Teaser
Lol, nice teaser, totally missed that part. Thanks for the problem and pointing out my mistake straight away.
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ruoxi.wang
busy
2018-03-21 06:56
RE: Another Brain Teaser
10, it is basically half of the second equation.
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ruoxi.wang
maths
2018-03-21 06:40
RE: Mathematics
13394567
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ruoxi.wang
puzzle
2018-03-15 21:32
RE: Puzzle -How many Squares?
Lol, the 50th and 51th are indeed well hidden. Thanks for the puzzle and the answer. I really enjoyed it .
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ruoxi.wang
puzzle
2018-03-14 06:52
RE: Puzzle -How many Squares?
I could only find 49 too... any hint on finding the other two?
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ruoxi.wang
riddle
2018-03-11 04:09
RE: Everyone is getting this riddle wrong. Can you work it out?
Nice problem, it reminded me again to double check everything before jumping to the conclusion _
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ruoxi.wang
teaser
2018-03-11 04:06
RE: Quick Teaser!
Seems like 40 to me?
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ruoxi.wang
steemstem
2018-03-03 16:22
RE: What you need to know to study Linear Algebra - #1 Vectors (with animations and pictures)
Nice introductory article except that 4,99 is a bit weird to represent a decimal :P
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