Question

From amongst six boys A, B, C, D, E, and F and five girls P, Q, R, S and T, a team of six is to be selected under the following coditions :

(i) A and D have to be together.

(ii) C cannot go with S.

(iii) S and T have to be together.

(iv) B cannot be teamed with E.

(v) D cannot go with P.

(vi) B and R have to be together.

(vii) C and Q have to be together.

Doctor P visits in between which of the following pairs of doctors ?

• A. S and V
• B. U and W
• C. R and W
• D. R and U
• E. None of these

Answer 1

The correct option is D R and U

We first form the sequence of visit using (iv), (v) and (vi).

From (iv), we know that Q visits first and U visits last.

From (v), we know that W visits first after break and is followed by R.

From (vi), we know that P visits after break.

Thus, the sequence of visit after break becomes W R P U.

Also, S has the same position in morning session as P in afternoon session. So, sequence of visit before break is Q, T / V, S, V / T.

Clearly, P visits between R and U