Geeta is decorating the cover of her school magazine. She is allowed to use only three colours from a group of six colours (P, Q, R, S, T and U), based on the following conditions.

I. If P, Q or R is chosen, U cannot be chosen.

II. Either T or U must be chosen.

III. S and Q cannot be chosen together.

If R is chosen, which of the following pairs of colours must also be chosen?

Given: Three colours from a group of six colours (P, Q, R, S, T and U), based on the following conditions.
I. If P, Q or R is chosen, U cannot be chosen.
II. Either T or U must be chosen.
III. S and Q cannot be chosen together.

From the above following arrangement will be- 

From Condition II, T must be chosen.

Since we need three colors in total, we must pick one more color alongside R and T.

The only remaining colors to choose from are P, Q, and S.

If we choose P or Q, we need to check whether they violate any condition.

The best choice that does not violate any rule is S, because choosing P would allow U, which contradicts Condition I.

Thus, the required pair is T and S.

Correct answer is (b) TS