(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.
At a time, on which day of a week all the three brothers are available at home ?
Option:
A. None
B. Sunday
C. Thursday
D. Canont be determined
E. None of these
Answer: A . None
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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, all the three brothers are not available at the same time on any day of the week.
