If 'X + Y' means 'X is the brother of Y', 'X × Y' means 'X is the father of Y' and 'X / Y' means 'X is the mother of Y', then which of the following would mean 'R is the son of S'?​​

Given: 

If 'X + Y' means 'X is the brother of Y', 'X × Y' means 'X is the father of Y' and 'X / Y' means 'X is the mother of Y'.

Now, we check each options.

Option (a): S × T × R

Option (b): S /R /T

Option (c): S × R + T 

Option (d): S + R × T

Option (c) is the following would mean 'R is the son of S'.

Thus, correct option is (c).