Find all triplets of positive integers $a$, $b$ and $c$ such that $a \geq b \geq c$ and
$\left(1+\frac{1}{a}\right)\left(1+\frac{1}{b}\right)\left(1+\frac{1}{c}\right)=2$
1. We start with the given equation:
   \[
   \left(1 + \frac{1}{a}\right)\left(1 + \frac{1}{b}\right)\left(1 + \frac{1}{c}\right) = 2
   \]
   and the condition \(a \geq b \geq c\).

2. Without loss of generality (WLOG), assume \(a \geq b \geq c\). This implies \(\frac{1}{c} \geq \frac{1}{b} \geq \frac{1}{a}\).

3. We can use the inequality:
   \[
   \left(1 + \frac{1}{a}\right)\left(1 + \frac{1}{b}\right)\left(1 + \frac{1}{c}\right) \leq \left(1 + \frac{1}{c}\right)^3
   \]
   because \(1 + \frac{1}{a} \leq 1 + \frac{1}{b} \leq 1 + \frac{1}{c}\).

4. Given that:
   \[
   \left(1 + \frac{1}{c}\right)^3 \geq 2
   \]
   we solve for \(c\):
   \[
   1 + \frac{1}{c} \geq \sqrt[3]{2}
   \]
   \[
   \frac{1}{c} \geq \sqrt[3]{2} - 1
   \]
   \[
   c \leq \frac{1}{\sqrt[3]{2} - 1}
   \]

5. Approximating \(\sqrt[3]{2} \approx 1.26\), we get:
   \[
   \sqrt[3]{2} - 1 \approx 0.26
   \]
   \[
   c \leq \frac{1}{0.26} \approx 3.85
   \]
   Since \(c\) is a positive integer, we have \(c \leq 3\). Therefore, \(c\) can be 1, 2, or 3.

6. We now check each possible value of \(c\):

   - For \(c = 1\):
     \[
     \left(1 + \frac{1}{a}\right)\left(1 + \frac{1}{b}\right)\left(1 + \frac{1}{1}\right) = 2
     \]
     \[
     \left(1 + \frac{1}{a}\right)\left(1 + \frac{1}{b}\right) \cdot 2 = 2
     \]
     \[
     \left(1 + \frac{1}{a}\right)\left(1 + \frac{1}{b}\right) = 1
     \]
     This is not possible since both terms are greater than 1. Hence, no solutions for \(c = 1\).

   - For \(c = 2\):
     \[
     \left(1 + \frac{1}{a}\right)\left(1 + \frac{1}{b}\right)\left(1 + \frac{1}{2}\right) = 2
     \]
     \[
     \left(1 + \frac{1}{a}\right)\left(1 + \frac{1}{b}\right) \cdot \frac{3}{2} = 2
     \]
     \[
     \left(1 + \frac{1}{a}\right)\left(1 + \frac{1}{b}\right) = \frac{4}{3}
     \]
     We solve for \(a\) and \(b\):
     \[
     \left(1 + \frac{1}{a}\right)\left(1 + \frac{1}{b}\right) = \frac{4}{3}
     \]
     \[
     1 + \frac{1}{a} + \frac{1}{b} + \frac{1}{ab} = \frac{4}{3}
     \]
     \[
     \frac{ab + a + b + 1}{ab} = \frac{4}{3}
     \]
     \[
     3(ab + a + b + 1) = 4ab
     \]
     \[
     3ab + 3a + 3b + 3 = 4ab
     \]
     \[
     ab - 3a - 3b = 3
     \]
     Solving this equation, we find the pairs \((a, b)\) that satisfy it:
     - \(a = 7, b = 6\)
     - \(a = 9, b = 5\)
     - \(a = 15, b = 4\)

     Thus, the solutions for \(c = 2\) are \((7, 6, 2)\), \((9, 5, 2)\), and \((15, 4, 2)\).

   - For \(c = 3\):
     \[
     \left(1 + \frac{1}{a}\right)\left(1 + \frac{1}{b}\right)\left(1 + \frac{1}{3}\right) = 2
     \]
     \[
     \left(1 + \frac{1}{a}\right)\left(1 + \frac{1}{b}\right) \cdot \frac{4}{3} = 2
     \]
     \[
     \left(1 + \frac{1}{a}\right)\left(1 + \frac{1}{b}\right) = \frac{3}{2}
     \]
     We solve for \(a\) and \(b\):
     \[
     \left(1 + \frac{1}{a}\right)\left(1 + \frac{1}{b}\right) = \frac{3}{2}
     \]
     \[
     1 + \frac{1}{a} + \frac{1}{b} + \frac{1}{ab} = \frac{3}{2}
     \]
     \[
     \frac{2ab + 2a + 2b + 2}{2ab} = \frac{3}{2}
     \]
     \[
     2ab + 2a + 2b + 2 = 3ab
     \]
     \[
     ab - 2a - 2b = 2
     \]
     Solving this equation, we find the pairs \((a, b)\) that satisfy it:
     - \(a = 8, b = 3\)
     - \(a = 5, b = 4\)

     Thus, the solutions for \(c = 3\) are \((8, 3, 3)\) and \((5, 4, 3)\).

7. Combining all solutions, we have the following triplets:
   - \((7, 6, 2)\)
   - \((9, 5, 2)\)
   - \((15, 4, 2)\)
   - \((8, 3, 3)\)
   - \((5, 4, 3)\)

The final answer is \( \boxed{ \{(7, 6, 2), (9, 5, 2), (15, 4, 2), (8, 3, 3), (5, 4, 3)\} } \).