Nine persons- A, B, C, D, E, F, G, H and I were born in different months from January, March, April, May, June, August, September, October and November of the same year but not necessarily in the same order. Only one person was born in each month.
| Month | Person |
| January | |
| March | |
| April | |
| May | |
| June | |
| August | |
| September | |
| October | |
| November | |
D was born in the month having 30 days.
Three persons were born between D and H.
Two persons were born between H and B, who was born immediately before I.
| | Case 1 | Case 2 | Case 3 |
| Month | Person | Person | Person |
| January | | | |
| March | | | B |
| April | | D | I |
| May | | B | |
| June | D | I | H |
| August | B | | |
| September | I | H | |
| October | | | |
| November | H | | D |
Two persons were born between C and I.
E was born immediately after C.
Thus, Case 1 gets cancelled.
| | Case 2 | Case 3 |
| Month | Person | Person |
| January | | |
| March | | B |
| April | D | I |
| May | B | |
| June | I | H |
| August | | C |
| September | H | E |
| October | C | |
| November | E | D |
A was born before G but not before April month.
| | Case 3 |
| Month | Person |
| January | |
| March | B |
| April | I |
| May | A |
| June | H |
| August | C |
| September | E |
| October | G |
| November | D |
Now, F is remaining.
| Month | Person |
| January | F |
| March | B |
| April | I |
| May | A |
| June | H |
| August | C |
| September | E |
| October | G |
| November | D |
This is the final arrangement.
Except I, all other persons were born in the month having an odd number days.
Study Notes
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