Consider the following statements:

On a planes having maximum and minimum principal stresses, there will be no tangential stress.

2. Shear stresses on mutually perpendicular planes are numerically equal.

3. Maximum shear stress is equal to half the sum of the maximum and minimum principal stresses.

Of these statements:

- 1
  
  $1, 2$ and $3$ are correct
- 2
  
  $1$ and $2$ are correct
- 3
  
  $2$ and $3$ are correct
- 4
  
  $1$ and $3$ are correct

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