Math Is Fun Forum

shocamefromebay

Member

Registered: 2007-05-30

Posts: 103

logic countting and everythign else

how do find the answer to this problem???
i forgot what teh question asked specifically but it gave me a pattern
and asked me to find like the so and so number/letter in the pattern
i forgot which one they asked for
it was somewhere in the 800's
but how do u do it
the pattern is
Y,R,Y,R,R,Y,R,R,R,Y,R,R,R,R,Y,R,R,R,R,R,Y,R,R,R,R,R,R,Y,R,R,R,R,R,R,R...

Last edited by shocamefromebay (2007-06-08 09:17:51)

George,Y

Member

Registered: 2006-03-12

Posts: 1,379

Re: logic countting and everythign else

RRRRRRRRRRRRRRRRRRRRRRRR...R (400 R's)

---

X'(y-Xβ)=0

Ricky

Moderator

Registered: 2005-12-04

Posts: 3,791

Re: logic countting and everythign else

RRRRRRRRRRRRRRRRRRRRRRRR... = S, right?

---

"In the real world, this would be a problem.  But in mathematics, we can just define a place where this problem doesn't exist.  So we'll go ahead and do that now..."

mathsyperson

Moderator

Registered: 2005-06-22

Posts: 4,900

Re: logic countting and everythign else

The nth term in the sequence is:

- Y, if n is odd.
- RRR... [n÷2 Rs], if n is even.

---

Why did the vector cross the road?
It wanted to be normal.

shocamefromebay

Member

Registered: 2007-05-30

Posts: 103

Re: logic countting and everythign else

im sry i really messed up with this thing
i forgot to put the commas in b/w the R's
there were supposed to be commas between the R's
sry
so taht kinda turns the whole question around kinda.
the answer was supposed to be like whether it was a S or R
really sry!

mathsyperson

Moderator

Registered: 2005-06-22

Posts: 4,900

Re: logic countting and everythign else

Ah, that makes things a bit more complicated. In that case, the nth term is Y if n is triangular and R otherwise.

For higher n, it's a bit hard to determine whether it's triangular straight away, so a possibly easier alternative is to say that the nth term is Y if (1+8n) is square, and R otherwise.

---

Why did the vector cross the road?
It wanted to be normal.

shocamefromebay

Member

Registered: 2007-05-30

Posts: 103

Re: logic countting and everythign else

so what does triangle mean?
and does that formula always work??
does square mean that its square or some other meaning?
all this jargon confuses me ...

Last edited by shocamefromebay (2007-06-08 11:49:34)

John E. Franklin

Member

Registered: 2005-08-29

Posts: 3,588

Re: logic countting and everythign else

http://www.mathsisfun.com/numberpatterns.html#triangular
http://www.mathsisfun.com/numberpattern … triangular
Hope this helps a little.

Y
RY
RRY
RRRY
RRRRY
RRRRRY
RRRRRRY
RRRRRRRY

Last edited by John E. Franklin (2007-06-08 14:34:15)

---

igloo myrtilles fourmis

shocamefromebay

Member

Registered: 2007-05-30

Posts: 103

Re: logic countting and everythign else

o0o
triangle is like factorial except you are supposed to add rather than multiply
o i get it
adn square is just squared numbers
i get it
thank you so much