Find Limit of Sequence An: 1-1/(n(n+1)/2)

In summary, the problem is asking to find the limit of the infinite product An=(1-1/3)(1-1/6)...(1-1/(n(n+1)/2)), and the attempt at a solution involves finding the general term in terms of n and using factorization to determine the limit.
  • #1
4c0
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Homework Statement



Find limit of sequence An=(1-1/3)(1-1/6)...(1-1/(n(n+1)/2))



Homework Equations





The Attempt at a Solution



I just found limit of 1-1/(n(n+1)/2) when n→∞,which is 1.Is that a proper solution?
 
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  • #2
4c0 said:

Homework Statement



Find limit of sequence An=(1-1/3)(1-1/6)...(1-1/(n(n+1)/2))

Homework Equations


The Attempt at a Solution



I just found limit of 1-1/(n(n+1)/2) when n→∞,which is 1.Is that a proper solution?

Homework Statement


Homework Equations


The Attempt at a Solution


I believe they're asking you to find the limit of that infinite product, not just the final term (the limit of which is clearly 1, as you've found).

Try to find an expression for the general term in terms of n. It'll be a quotient. Factorise the numerator.

Now see what happens when you multiply one term by the next. Then multiply by the next. Do this until you see a pattern emerging. What terms cancel out and what are you left with?
 

Related to Find Limit of Sequence An: 1-1/(n(n+1)/2)

1. What is a sequence and what is its limit?

A sequence is a list of numbers in a specific order. The limit of a sequence is the number that the sequence approaches as the index approaches infinity.

2. How do you find the limit of a sequence?

To find the limit of a sequence, we can use the formula: limit = 1/(1-r), where r is the common ratio of the sequence. In this case, the common ratio is 1/2, so the limit is 2.

3. What is the formula for finding the limit of a geometric sequence?

The formula for finding the limit of a geometric sequence is: limit = 1/(1-r), where r is the common ratio of the sequence.

4. How do you prove the limit of a sequence?

The limit of a sequence can be proven by showing that for any positive number ε, there exists a natural number N such that for all n>N, the absolute value of the difference between the limit and the nth term of the sequence is less than ε.

5. Can the limit of a sequence be any number?

No, the limit of a sequence must be a real number or positive or negative infinity. It cannot be imaginary or undefined.

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