Let $n,k$ be positive integers such that $n\geq2k>3$ and $A= \{1,2,...,n\}.$ Find all $n$ and $k$ such that the number of $k$-element subsets of $A$ is $2n-k$ times bigger than the number of $2$-element subsets of $A.$
We need to solve the equation:
\[
\binom{n}{k} = (2n - k) \cdot \binom{n}{2}
\]

First, recall the binomial coefficient definitions:
\[
\binom{n}{k} = \frac{n!}{k!(n-k)!} \quad \text{and} \quad \binom{n}{2} = \frac{n(n-1)}{2}
\]

Substituting these into the equation, we get:
\[
\frac{n!}{k!(n-k)!} = (2n - k) \cdot \frac{n(n-1)}{2}
\]

Multiplying both sides by \(2k!(n-k)!\) to clear the denominators:
\[
2n! = (2n - k) \cdot n(n-1) \cdot k!(n-k)!
\]

Simplifying, we get:
\[
2 = (2n - k) \cdot \frac{n(n-1)}{n! / (k!(n-k)!)} = (2n - k) \cdot \frac{n(n-1)k!(n-k)!}{n!}
\]

Next, we simplify the factorials:
\[
2 = (2n - k) \cdot \frac{n(n-1)}{(n-k)(n-k-1)\cdots(n-1)}
\]

Assuming \(k \geq 6\), we have:
\[
2 \cdot n! = k! (n-k)! (2n-k) n (n-1)
\]

Simplifying further:
\[
2 (n-2) \cdots (k+1) = (n-k)! (2n-k)
\]

Rewriting the binomial coefficient:
\[
\binom{n-2}{k-2} = \frac{(2n-k) \cdot k \cdot (k-1)}{2}
\]

Since \(\binom{n-2}{k-2} \geq \binom{n-2}{4}\), we have:
\[
\frac{(n-5)(n-4)(n-3)(n-2)}{24} \leq \frac{(2n-6)k(k-1)}{2}
\]

Simplifying:
\[
24k(k-1) \geq (n-5)(n-4)(n-2) \geq (2k-5)(2k-4)(2k-2)
\]

This implies:
\[
6k \geq (2k-5)(k-2)
\]

Solving the inequality:
\[
2k^2 - 15k + 10 \leq 0
\]

For \(k \geq 7\), the inequality does not hold. Thus, we need to check for \(2 \leq k \leq 6\).

1. For \(k = 2\):
\[
\binom{n}{2} = (2n-2) \cdot \binom{n}{2}
\]
\[
2n-2 = 1 \quad \text{(contradiction)}
\]

2. For \(k = 3\):
\[
\binom{n}{3} = (2n-3) \cdot \binom{n}{2}
\]
\[
(n-2) = 3(2n-3) \quad \text{or} \quad 7 = 5n \quad \text{(contradiction)}
\]

3. For \(k = 4\):
\[
\binom{n}{4} = (2n-4) \cdot \binom{n}{2}
\]
\[
\frac{(n-2)(n-3)}{12} = 2(n-2)
\]
\[
n = 27 \quad \text{(solution)}
\]

4. For \(k = 5\):
\[
\binom{n}{5} = (2n-5) \cdot \binom{n}{2}
\]
\[
\frac{(n-2)(n-3)(n-4)}{60} = (2n-5)
\]
Observe that \((2n-5) > (n-4)\) and is coprime with \((n-2), (n-3)\).

5. For \(k = 6\):
\[
\binom{n}{6} = (2n-6) \cdot \binom{n}{2}
\]
\[
\frac{(n-2)(n-3)(n-4)(n-5)}{60 \cdot 6} = 2(n-3)
\]
\[
(n-2)(n-4)(n-5) = 12 \cdot 60
\]
\[
(n-4) < \sqrt[3]{12 \cdot 60} < (n-2)
\]

It follows that \(n-4 \leq 8\) and \(n-2 \geq 9\), therefore \(11 \leq n \leq 12\), and you can check that they do not satisfy the condition because the left part is divisible by \(7\).

The final answer is \( \boxed{ n = 27 } \) and \(k = 4\).