**(I).** Kamal is available at home from 12 noon to 4 p.m. on Tuesday, Thursday and Sunday.**(II).** His younger brother Navin is available at home on Monday, Thursday, Friday and Sunday between 10 a.m. to 2 p.m.**(III).** The eldest brother Rajiv is available between 9 a.m. to 12 noon on Monday, Wednesday and Thursday and 2 p.m. to 4 p.m. on Friday, Saturday and Sunday.

**For how many days only one brother is available at a particular time in a week ? **

** Option:**

**A.**One

**B.**Two

**C.**Three

**D.**Four

**E.**None of these

**Answer: D . Four**

** Justification:**

We prepare a table as under :

Mon | Tue | Wed | Thu | Fri | Sat | Sun | |

9 a.m. to 10 a.m. | R | R | R | ||||

10 a.m. to 12 noon | N, R | R |
N, R |
N | N | ||

12 noon to 2 p.m. | N | K | K, N | N | K, N | ||

2 p.m. to 4 p.m. | K | K | R | R | K, R |

Clearly, **One brother is available time on all seven days of the week.**