21 October 2025

• curprev 23:4423:44, 21 October 2025 MRENTHUSIASM talk contribs 12,051 bytes −544 Removed redundant explanation
• curprev 21:5521:55, 21 October 2025 Math-lover1 talk contribs m 12,595 bytes +52 →Solution 1 (Casework): explanation for \binom{13}{k} - 1
• curprev 21:5121:51, 21 October 2025 Math-lover1 talk contribs 12,543 bytes +492 →Solution 1 (Casework): explanation for \binom{13}{k} - 1

10 August 2025

• curprev 17:2917:29, 10 August 2025 T3chn0b14d3 talk contribs m 12,051 bytes +8 →Solution 4 (Engineer's Induction)

6 August 2025

• curprev 22:1922:19, 6 August 2025 Martin wang talk contribs 12,043 bytes +65 →Solution 6 (10 Seconds Solution)

23 October 2024

• curprev 23:5623:56, 23 October 2024 MRENTHUSIASM talk contribs 11,978 bytes +2 →Solution 1 (Casework)
• curprev 19:2119:21, 23 October 2024 Mathboy282 talk contribs 11,976 bytes +31 →Solution 1 (Casework)
• curprev 19:2019:20, 23 October 2024 Mathboy282 talk contribs 11,945 bytes −81 Undo revision 230455 by Mathboy282 (talk) Tag: Undo
• curprev 19:1919:19, 23 October 2024 Mathboy282 talk contribs 12,026 bytes +81 →Solution 1 (Casework)

21 September 2024

• curprev 08:4308:43, 21 September 2024 MRENTHUSIASM talk contribs 11,945 bytes −26 No edit summary

20 September 2024

• curprev 16:2016:20, 20 September 2024 Glowworm talk contribs m 11,971 bytes 0 →Problem
• curprev 16:2016:20, 20 September 2024 Glowworm talk contribs 11,971 bytes −1 →Problem
• curprev 16:1916:19, 20 September 2024 Glowworm talk contribs m 11,972 bytes 0 →Problem
• curprev 16:1816:18, 20 September 2024 Glowworm talk contribs 11,972 bytes +1 →Problem
• curprev 16:1716:17, 20 September 2024 Glowworm talk contribs 11,971 bytes 0 →Problem
• curprev 16:1716:17, 20 September 2024 Glowworm talk contribs m 11,971 bytes +26 →Problem

31 July 2024

• curprev 15:2515:25, 31 July 2024 Iwowowl253 talk contribs m 11,945 bytes +2 →Solution 3 (Recursion)
• curprev 15:2515:25, 31 July 2024 Iwowowl253 talk contribs m 11,943 bytes −8 →Solution 3 (Recursion)
• curprev 15:2415:24, 31 July 2024 Iwowowl253 talk contribs m 11,951 bytes +31 →Solution 3 (Recursion)

25 July 2024

• curprev 00:3600:36, 25 July 2024 Iamtheone45 talk contribs 11,920 bytes +2 →Solution 5 (Subsets Bijection)
• curprev 00:3500:35, 25 July 2024 Iamtheone45 talk contribs 11,918 bytes −54 →Solution 5 (Subsets Bijection)
• curprev 00:3500:35, 25 July 2024 Iamtheone45 talk contribs 11,972 bytes +706 →Solution 5 (Subsets Bijection)

26 May 2024

• curprev 01:4001:40, 26 May 2024 MRENTHUSIASM talk contribs 11,266 bytes +14 →Solution 4 (Engineer's Induction)
• curprev 01:2701:27, 26 May 2024 Loadingnoob talk contribs 11,252 bytes +159 →Solution 4 (Engineer's Induction)

25 October 2023

• curprev 22:4322:43, 25 October 2023 MRENTHUSIASM talk contribs 11,093 bytes +116 →Video Solution by MRENTHUSIASM (English & Chinese)
• curprev 22:4322:43, 25 October 2023 MRENTHUSIASM talk contribs 10,977 bytes −114 →Video Solution by Math-X (Smart and Simple)
• curprev 17:4617:46, 25 October 2023 Math-x talk contribs 11,091 bytes 0 No edit summary
• curprev 17:4417:44, 25 October 2023 Math-x talk contribs 11,091 bytes +114 No edit summary
• curprev 15:5015:50, 25 October 2023 Dragonfly75 talk contribs 10,977 bytes −27 →Video Solution (⚡️ Just 1 min! ⚡️)

7 September 2023

• curprev 21:5321:53, 7 September 2023 Thestudyofeverything talk contribs 11,004 bytes +14 →Video Solution (Just 1 min!)

12 August 2023

• curprev 23:4023:40, 12 August 2023 Oinava talk contribs m 10,990 bytes +5 →Solution 5 (Alternative)

23 July 2023

• curprev 16:0216:02, 23 July 2023 Nsaops talk contribs m 10,985 bytes 0 →Solution 4 (Engineer's Induction)

14 July 2023

• curprev 22:0422:04, 14 July 2023 Thestudyofeverything talk contribs 10,985 bytes +108 →Solution 5 (Alternative)

10 June 2023

• curprev 10:2010:20, 10 June 2023 Mrthinker talk contribs 10,877 bytes −32 No edit summary

28 January 2023

• curprev 00:4100:41, 28 January 2023 MRENTHUSIASM talk contribs 10,909 bytes +103 →Video Solution by Steven Chen

21 January 2023

• curprev 01:5601:56, 21 January 2023 MRENTHUSIASM talk contribs 10,806 bytes 0 →Solution 1 (Casework)

18 December 2022

• curprev 15:2415:24, 18 December 2022 Account123123123 talk contribs m 10,806 bytes +127 No edit summary

5 December 2022

• curprev 16:2816:28, 5 December 2022 Mrthinker talk contribs 10,679 bytes −47 →Problem

17 November 2022

• curprev 03:0203:02, 17 November 2022 MRENTHUSIASM talk contribs 10,726 bytes −3 →Solution 1 (Casework)

15 November 2022

• curprev 16:0916:09, 15 November 2022 Sugar rush talk contribs 10,729 bytes +50 No edit summary

14 November 2022

• curprev 01:4301:43, 14 November 2022 Pluginl talk contribs 10,679 bytes 0 →Video Solution By Steven Chen
• curprev 01:4201:42, 14 November 2022 Pluginl talk contribs 10,679 bytes +21 →Solution
• curprev 01:2601:26, 14 November 2022 MRENTHUSIASM talk contribs 10,658 bytes 0 →Solution 5 (Alternative)
• curprev 01:2401:24, 14 November 2022 MRENTHUSIASM talk contribs 10,658 bytes +1 →Solution 1 (Casework)
• curprev 01:0801:08, 14 November 2022 Indiiiigo talk contribs m 10,657 bytes −1 We can't choose k=13 because this means we're placing all the cards on the first/second pass (however it's defined), but both of these violate the conditions of the problem, so they must be added in separately.

13 November 2022

• curprev 22:4022:40, 13 November 2022 Pluginl talk contribs 10,658 bytes −40 →Solution 3 (Recursion)
• curprev 22:3922:39, 13 November 2022 Pluginl talk contribs 10,698 bytes +14 →Solution 5
• curprev 22:3622:36, 13 November 2022 Pluginl talk contribs 10,684 bytes +514 →Solution 4 (Engineer's Induction)
• curprev 21:1221:12, 13 November 2022 MRENTHUSIASM talk contribs 10,170 bytes +64 →Solution 1 (Casework)
• curprev 21:0821:08, 13 November 2022 MRENTHUSIASM talk contribs 10,106 bytes +852 No edit summary