Free sample · Sec 1
Date logic — eliminate, then conclude
eliminating dates step by step until one possibility remains.
Reasoning sample with original dates — not an Olympiad scrape.
I Do
Worked example
Asha’s picnic is on exactly one of these dates: 7 Apr, 12 Apr, 7 May, 15 May, 12 Jun, 15 Jun.
Possible dates
- 7 Apr
- 12 Apr
- 7 May
- 15 May
- 12 Jun
- 15 Jun
Eliminate the month
Clue 1: The picnic is not in April. Cross out 7 Apr and 12 Apr.
Left: 7 May, 15 May, 12 Jun, 15 Jun.
Eliminate the day
Clue 2: The day is not the . Cross out 7 May.
Left: 15 May, 12 Jun, 15 Jun.
Eliminate again — conclude
Clue 3: The month is not June. Cross out 12 Jun and 15 Jun.
Only 15 May remains. So Asha’s picnic is on 15 May.
Move: eliminate month then eliminate day then eliminate month. Why: each clue removes a whole group until one date is left.
We Do
Try this step
After Clue 1 (not April), the list is 7 May, 15 May, 12 Jun, 15 Jun. Clue 2 says the day is not the . Which dates remain?
You Do
On your own
From 15 May, 12 Jun, 15 Jun, Clue 3 says the month is not June. What is Asha’s picnic date?
The full Sec 1 path continues from here
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