# 2nd order difference equn

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Why are both the numbers 1 and 1? I thought it'd be 2 and 1

Why are both the numbers 1 and 1? I thought it'd be 2 and 1

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#2

enjoy math 😂😂😂😂😂 ..... i dont like math but .....i have 3math books in this semester. .....i study partial differential equations, derivatives, integration ,. so difficult 😰

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enjoy math 😂😂😂😂😂 ..... i dont like math but .....i have 3math books in this semester. .....i study partial differential equations, derivatives, integration ,. so difficult 😰

**Mr.Rahul Tiwari**)enjoy math 😂😂😂😂😂 ..... i dont like math but .....i have 3math books in this semester. .....i study partial differential equations, derivatives, integration ,. so difficult 😰

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(Original post by

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Why are both the numbers 1 and 1? I thought it'd be 2 and 1

**will'o'wisp2**)https://cdn.discordapp.com/attachmen...80/unknown.png

Why are both the numbers 1 and 1? I thought it'd be 2 and 1

(1) You can either start with a 1, and follow up with a sequence adding up to n.

(2) Or you can start with a 2, and follow up with a sequence adding up to n-1.

How many sequences will work for (1)?

How many sequences will work for (2)?

So...?

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#5

may I any help you. .......you study in ... which standard .....

are you from which country

are you from which country

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(Original post by

Consider building a sequence adding up to n+1.

(1) You can either start with a 1, and follow up with a sequence adding up to n.

(2) Or you can start with a 2, and follow up with a sequence adding up to n-1.

How many sequences will work for (1)?

How many sequences will work for (2)?

So...?

**DFranklin**)Consider building a sequence adding up to n+1.

(1) You can either start with a 1, and follow up with a sequence adding up to n.

(2) Or you can start with a 2, and follow up with a sequence adding up to n-1.

How many sequences will work for (1)?

How many sequences will work for (2)?

So...?

and n sequences for 2?

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(Original post by

No. Read carefully what I wrote and compare it with how your question defines Xn

**DFranklin**)No. Read carefully what I wrote and compare it with how your question defines Xn

So if you start with a 1 then you can make X1 etc if you start with 2 then you make ??? it doesn't work for X1 but for every sequence after thatbut i still don't understand why it shouldn't be 2,1

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#9

Again, look at what I wrote, compare it to the definition of Xn, and then see if you can answer the 2 sub-questions I gave you.

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Again, look at what I wrote, compare it to the definition of Xn, and then see if you can answer the 2 sub-questions I gave you.

**DFranklin**)Again, look at what I wrote, compare it to the definition of Xn, and then see if you can answer the 2 sub-questions I gave you.

so with 1 you work with any combinations of 1 and 2 and make that up to n

the number of sequences that will work when you start with 1 is n number of sequences as show by Xn where X1=1 and X2=2 etc

with 2 you can also work with any combo of 1 and 2 to make the n-1 term

the number of terms you can make when you start with 2 is n-1 because starting with 2 can't ever make X1 but it will make any other Xn provided the n is not 1

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#11

After all you've written, it's still not that clear what you're saying are the answers to the 2 questions I asked. I think you're saying the answers are n and n-1 in which case you are wrong (in fact it's clear you are 100% barking up the wrong tree).

In particular, stop fixating on "if you start with 2 you can't ever make X1", because this is a total red herring that is leading you astray.

I will ask the first 2 questions again, being even more explicit about what is going on:

Consider building a sequence adding up to n+1.

(1) You can either start with a 1, and follow up with

Now,

(2) You can either start with a 2, and follow up with

Now,

I feel you are still jumping off into your own thoughts rather than answering the questions I am asking you. You should be able to answer all 4 questions (the parts in either bold italic or italic) in considerably less than 40 characters. (And with very little effort or calculation).

In particular, stop fixating on "if you start with 2 you can't ever make X1", because this is a total red herring that is leading you astray.

I will ask the first 2 questions again, being even more explicit about what is going on:

Consider building a sequence adding up to n+1.

(1) You can either start with a 1, and follow up with

**a sequence of 1s and 2s which add up to n**.Now,

**look at the definition of X_n**, and**write down how many such sequences there are.***So, how many possible sequences are there in case (1)?*(2) You can either start with a 2, and follow up with

**a sequence of 1s and 2s which add up to n-1**.Now,

**look at the definition of X_n**, and**write down how many such sequences there are.***So, how many possible sequences are there in case (2)?*I feel you are still jumping off into your own thoughts rather than answering the questions I am asking you. You should be able to answer all 4 questions (the parts in either bold italic or italic) in considerably less than 40 characters. (And with very little effort or calculation).

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